Merge: the advice tap points both ways

Claude-Session: https://claude.ai/code/session_01KGACAtTPjvZ2PipDZ5qD99

internal/auth/pairlang_test.go

@@ -180,14 +180,17 @@ func TestDirectionRoundTrip(t *testing.T) {
 	}
 }
 
-// The refusal this axis exists to make: a pair with no word list cannot be
-// learned toward, however good its langpack is. fr, es and pt-PT all have copy,
-// voices and spelling dictionaries — and nothing that could segment a sentence
-// or read from that language into English, which is what a learner needs.
+// The refusal this axis exists to make: a pair with no learner-side data cannot
+// be learned toward, however good its langpack is. fr and es have copy, voices
+// and spelling dictionaries, and no `learner` block in their packs to offer the
+// choice with — so the server keeps saying no until one is written.
+//
+// pt-PT is deliberately no longer in this list; see TestLearnerDirectionForPtPT
+// below and the argument in `learnerPairs`.
 func TestLearnerDirectionRefusedForPairsWithoutData(t *testing.T) {
 	_, users, _ := newStores(t)
 
-	for _, lang := range []string{"pt-PT", "fr", "es"} {
+	for _, lang := range []string{"fr", "es"} {
 		if err := users.SetPair("bob", lang, DirectionLearningEn); err != nil {
 			t.Fatalf("set %s: %v", lang, err)
 		}
@@ -201,6 +204,37 @@ func TestLearnerDirectionRefusedForPairsWithoutData(t *testing.T) {
 	}
 }
 
+// The other direction of that same rule, and the one a native English speaker
+// writing Portuguese depends on.
+//
+// This is not only a settings toggle: `direction` is what decides which language
+// Petal *explains* in (see suggestions.targetFor), so an account that cannot
+// reach learning_pair gets its Portuguese annotated in Portuguese with no way to
+// ask for English. Pinned in both directions — the move must take, and it must
+// still be there when the account is read back.
+func TestLearnerDirectionForPtPT(t *testing.T) {
+	_, users, _ := newStores(t)
+
+	if err := users.SetPair("bob", "pt-PT", DirectionLearningEn); err != nil {
+		t.Fatalf("set pt-PT: %v", err)
+	}
+	if w := patchMe(t, users, "bob", `{"direction":"learning_pair"}`); w.Code != http.StatusOK {
+		t.Fatalf("status = %d (%s), want 200", w.Code, w.Body.String())
+	}
+	u, _ := users.Get("bob")
+	if u.Direction != DirectionLearningPair || u.PairLang != "pt-PT" {
+		t.Fatalf("account = %+v, want pt-PT learning_pair", u)
+	}
+
+	// And it can be turned back, the same as zh.
+	if w := patchMe(t, users, "bob", `{"direction":"learning_en"}`); w.Code != http.StatusOK {
+		t.Fatalf("turn back: status = %d (%s)", w.Code, w.Body.String())
+	}
+	if u, _ := users.Get("bob"); u.Direction != DirectionLearningEn {
+		t.Fatalf("direction = %q after turning back", u.Direction)
+	}
+}
+
 // The two-field combination the handler validates as one decision. An account
 // already learning Chinese that asks only to change pair is asking for a state
 // neither field names on its own — French with segmentation — and it must not

internal/auth/users.go

@@ -104,19 +104,34 @@ const (
 // The pairs whose *learner* direction Petal can actually serve, which is a
 // narrower thing than a shipped pair and narrower again than a langpack.
 //
-// Turning a pair around needs data no langpack carries: a word list to segment
-// with, and a dictionary that reads from the pair language into English. Chinese
-// has both as of Phase 26 (CC-CEDICT + jieba); French, Spanish and Portuguese
-// have neither yet, and — unlike a missing pack, which leaves a writer looking
-// at copy she cannot read — a missing word list would leave her looking at an
-// editor that silently does nothing when she hovers. Both are bad; only one is
-// legible as a bug. So the server refuses, for the same reason and by the same
-// mechanism as `shippedPairs`.
+// Turning a pair around needs data no langpack carries: a way to find word
+// boundaries, and a dictionary that reads from the pair language into English. A
+// pair missing either would leave a writer looking at an editor that silently
+// does nothing when she hovers — worse than a missing pack, which at least reads
+// as a bug rather than as an absence. So the server refuses, for the same reason
+// and by the same mechanism as `shippedPairs`.
 //
-// This list is expected to grow one pair at a time and never to be inferred:
-// segmentation is a property of a writing system, and there is no rule that
-// derives "has a word list" from a language code.
-var learnerPairs = []string{"zh"}
+// Chinese has both as of Phase 26 (CC-CEDICT + jieba). Portuguese turns out to
+// have both as well, and the original note here — "French, Spanish and
+// Portuguese have neither" — was written one phase too early to see it:
+//
+//   - Word boundaries are spaces. The megabyte word list jieba needs is a
+//     property of a writing system that doesn't use them, not a debt every pair
+//     owes; a Latin-script pair needs nothing loaded to be segmented.
+//   - The dictionary arrived with dict.db, which reads pt→en as readily as
+//     en→pt (see lexicon.dreamProvider.reverse). The reverse lookup the hover
+//     and the word card need is already there and already answering.
+//
+// So the pair a native English speaker learning Portuguese needs is real, and
+// what was actually blocking it was this list. French and Spanish clear the same
+// two bars through the same dict.db; they are held back only by their packs
+// carrying no `learner` copy yet (see Pack.learner), which is a translation
+// question rather than a data one.
+//
+// This list is still expected to grow one pair at a time and never to be
+// inferred: segmentation is a property of a writing system, and there is no rule
+// that derives "has a word list" from a language code.
+var learnerPairs = []string{"zh", "pt-PT"}
 
 // SupportsLearnerDirection reports whether a pair can be turned around.
 func SupportsLearnerDirection(lang string) bool {

internal/lexicon/handlers.go

@@ -49,10 +49,19 @@ func (h *Handler) GlossRoutes() chi.Router {
 // It does not go through [Handler.providerFor], and that is not an oversight.
 // providerFor picks a dictionary by the writer's *pair*, to answer "what does
 // this English word mean in her language" — a question whose answer differs per
-// pair. This endpoint asks the opposite question of exactly one language, and
-// [auth.SupportsLearnerDirection] already guarantees that language is Chinese.
-// Routing it through the pair would add a database read per hover to choose
-// between one option and itself.
+// pair. This endpoint asks the opposite question of exactly one language: it
+// reads hanzi, and hanzi are Chinese whoever is looking them up. Routing it
+// through the pair would add a database read per hover to choose between one
+// option and itself.
+//
+// What no longer holds is the reason this used to give — that
+// [auth.SupportsLearnerDirection] guarantees the caller is on the zh pair. Since
+// Portuguese joined `learnerPairs` a learning_pair account may be Portuguese, so
+// the guarantee now comes from the *caller*: the client only ever asks this
+// route about a token its Chinese segmenter found, and that segmenter is loaded
+// only for the zh pair (see useSegmenter in App.tsx). A stray lookup is still
+// answered safely — a word the Chinese dictionary has never heard of is a 200
+// with empty lists, exactly like any other miss.
 func (h *Handler) HanziRoutes() chi.Router {
 	r := chi.NewRouter()
 	r.Get("/{word}", h.hanzi)

internal/llm/lang_test.go

@@ -44,7 +44,7 @@ func TestPromptsNameTheWritersLanguage(t *testing.T) {
 		t.Fatalf("collocation prompt lost its tone guidance:\n%s", collocation)
 	}
 
-	translate := TranslateMessages("Try a shorter sentence here.", pt)[0].Content
+	translate := TranslateMessages("Try a shorter sentence here.", English, pt)[0].Content
 	if !strings.Contains(translate, "European Portuguese") || strings.Contains(translate, "Chinese") {
 		t.Fatalf("translate prompt targets the wrong language:\n%s", translate)
 	}
@@ -76,7 +76,7 @@ func TestDefaultPairStillReadsAsBefore(t *testing.T) {
 	if got := CollocationMessages("x", "", EnglishTarget(zh))[0].Content; !strings.Contains(got, "Simplified Chinese (Mandarin) gloss in parentheses") {
 		t.Fatalf("zh collocation gloss changed:\n%s", got)
 	}
-	if got := TranslateMessages("x", zh)[0].Content; !strings.Contains(got, "natural, friendly Simplified Chinese (Mandarin)") {
+	if got := TranslateMessages("x", English, zh)[0].Content; !strings.Contains(got, "natural, friendly Simplified Chinese (Mandarin)") {
 		t.Fatalf("zh translate target changed:\n%s", got)
 	}
 	if got := AskPetalSystemPrompt("a", "b", "c", "d", "e", zh); !strings.Contains(got, "为什么") {

internal/llm/prompts.go

@@ -329,23 +329,29 @@ func RewriteMessages(text, style string) []Message {
 }
 
 // translateSystemPrompt drives the explanation translator: it renders a
-// suggestion's English explanation into the writer's own language so an ESL
-// reader sees the "why" in her first language. Strict about returning ONLY the
-// translation (no quotes, no romanisation, no English echo) so it can drop
-// straight into the chat bubble. Kept warm and plain — these are short, friendly
-// one-liners.
-const translateSystemPrompt = `You are Petal, a warm writing assistant. Translate the English text the user ` +
-	`sends into natural, friendly %[1]s. It is a short explanation of a writing ` +
-	`suggestion, written for a native %[1]s speaker learning English.
+// suggestion's explanation into the half of the pair the explanation is not
+// already in, so the "why" is readable from both sides. Strict about returning
+// ONLY the translation (no quotes, no romanisation, no echo of the source) so it
+// can drop straight into the chat bubble. Kept warm and plain — these are short,
+// friendly one-liners.
+//
+// Both languages are parameters because neither end is a constant. Until Phase
+// 28 the source was always English and the destination always hers; a document
+// written in her own language is explained in her own language, and then the tap
+// runs the other way, into the English she is practising.
+const translateSystemPrompt = `You are Petal, a warm writing assistant. Translate the %[1]s text the user ` +
+	`sends into natural, friendly %[2]s. It is a short explanation of a writing ` +
+	`suggestion, written for someone who is learning one of %[1]s and %[2]s and reads the other most easily.
 
-Respond with ONLY the %[1]s translation. No quotation marks, no romanisation, no English, no preamble — ` +
+Respond with ONLY the %[2]s translation. No quotation marks, no romanisation, no %[1]s, no preamble — ` +
 	`just the translated sentence.`
 
-// TranslateMessages builds the message array for translating one short English
-// explanation into the writer's own language.
-func TranslateMessages(text string, lang Lang) []Message {
+// TranslateMessages builds the message array for rendering one short
+// explanation out of the language it arrived in and into the other half of the
+// writer's pair.
+func TranslateMessages(text string, from, to Lang) []Message {
 	return []Message{
-		{Role: "system", Content: fmt.Sprintf(translateSystemPrompt, lang.Name)},
+		{Role: "system", Content: fmt.Sprintf(translateSystemPrompt, from.Name, to.Name)},
 		{Role: "user", Content: text},
 	}
 }

internal/llm/translate.go

@@ -4,13 +4,14 @@ import (
 	"context"
 )
 
-// RunTranslate renders a short English explanation into the writer's own
-// language. It is a one-shot Complete (the result seeds the Ask Petal bubble),
-// kept at a low temperature so the translation is faithful rather than creative. Output is
-// trimmed of any stray surrounding quotes the model may add.
-func RunTranslate(ctx context.Context, client LLMClient, text string, lang Lang) (string, error) {
+// RunTranslate renders a short explanation out of the language it was written
+// in and into the other half of the writer's pair. It is a one-shot Complete
+// (the result seeds the Ask Petal bubble), kept at a low temperature so the
+// translation is faithful rather than creative. Output is trimmed of any stray
+// surrounding quotes the model may add.
+func RunTranslate(ctx context.Context, client LLMClient, text string, from, to Lang) (string, error) {
 	out, err := client.Complete(ctx, CompletionRequest{
-		Messages:          TranslateMessages(text, lang),
+		Messages:          TranslateMessages(text, from, to),
 		MaxTokens:         512,
 		Temperature:       0.2,
 		TopP:              0.9,

internal/suggestions/doclang_test.go

@@ -119,8 +119,36 @@ func TestDocumentLangNeedsCorroboration(t *testing.T) {
 	}
 }
 
-// The two language decisions are genuinely independent, and only the zh pair can
-// prove it today — it is the one pair that can be travelled in both directions.
+// The Portuguese half of the same rule, and the bug it was reported as: "the
+// Portuguese option isn't translating the advice in English — it's just
+// reprinting Portuguese."
+//
+// Nothing was wrong with targetFor when that was reported. It was reading a
+// direction the account could not leave: `learnerPairs` held only zh, so every
+// pt-PT writer was learning_en by force and this function correctly explained a
+// Portuguese document in Portuguese. Pinned here rather than only in the auth
+// package because this is where the consequence actually lands — the language
+// the writer reads her advice in.
+func TestTargetExplainsPortugueseInEnglishForALearner(t *testing.T) {
+	learner := targetFor("pt-PT", auth.DirectionLearningPair, docLangPair)
+	if learner.Correct.Code != "pt-PT" {
+		t.Fatalf("corrected in %s, want the document's own Portuguese", learner.Correct.Code)
+	}
+	if learner.Explain.Code != "en" {
+		t.Fatalf("explained in %s, want English", learner.Explain.Code)
+	}
+
+	// And the native Portuguese speaker practising English is untouched: her
+	// Portuguese is still explained in Portuguese.
+	native := targetFor("pt-PT", auth.DirectionLearningEn, docLangPair)
+	if native.Correct.Code != "pt-PT" || native.Explain.Code != "pt-PT" {
+		t.Fatalf("learning_en on a Portuguese document: correct=%s explain=%s", native.Correct.Code, native.Explain.Code)
+	}
+}
+
+// The two language decisions are genuinely independent, and zh was the first
+// pair that could prove it — the first that could be travelled in both
+// directions.
 //
 // A Mandarin native practising English who writes Chinese wants Chinese
 // corrections explained in Chinese. An English native learning Chinese who writes
@@ -343,10 +371,15 @@ func seedExplanation(t *testing.T, h *Handler, docID, explanation string) string
 
 // The tap-through has to read the same decision the card was written under. On a
 // Portuguese document by a Portuguese writer the explanation already arrived in
-// Portuguese, and the old endpoint would have sent it to the model to be
-// rendered into Portuguese again.
-func TestTranslateSkipsWhenTheExplanationIsAlreadyHers(t *testing.T) {
-	client := &stubClient{response: "Não devia ser chamado."}
+// Portuguese, so the destination is the other half of the pair — the English she
+// is practising — and never Portuguese into Portuguese again.
+//
+// This pins the report that "Petal presents the Ask Petal advice in both
+// sections as Portuguese": the endpoint used to answer "" here, which left the
+// card Portuguese, the bubble beneath it the same Portuguese, and no English on
+// the card at all for a writer whose whole reason for the pair is English.
+func TestTranslateRendersHerExplanationIntoTheEnglishSheIsLearning(t *testing.T) {
+	client := &stubClient{response: "Use this one here."}
 	srv, docID, h := newDirectedServer(t, client, "pt-PT", auth.DirectionLearningEn, ptDocument)
 	setDocLang(t, h, docID, docLangPair)
 	sugID := seedExplanation(t, h, docID, "Aqui usa-se isto.")
@@ -359,11 +392,14 @@ func TestTranslateSkipsWhenTheExplanationIsAlreadyHers(t *testing.T) {
 	if err := json.Unmarshal(rec.Body.Bytes(), &out); err != nil {
 		t.Fatalf("decode: %v", err)
 	}
-	if out.Translation != "" {
-		t.Fatalf("translation = %q, want empty: the bubble seeds from the explanation itself", out.Translation)
+	if out.Translation == "" {
+		t.Fatal("a Portuguese explanation left the tap with nowhere to go")
 	}
-	if client.calls != 0 {
-		t.Fatal("the model was asked to render Portuguese into Portuguese")
+	if !strings.Contains(client.lastPrompt, "into natural, friendly English") {
+		t.Fatalf("translate didn't render into English:\n%s", client.lastPrompt)
+	}
+	if strings.Contains(client.lastPrompt, "into natural, friendly European Portuguese") {
+		t.Fatalf("the model was asked to render Portuguese into Portuguese:\n%s", client.lastPrompt)
 	}
 }
 

internal/suggestions/translate.go

@@ -30,11 +30,18 @@ type translateResponse struct {
 // this endpoint has to read the same decision back, or it round-trips Portuguese
 // into Portuguese and calls it a translation.
 //
-// So: render into whichever half the explanation is NOT already in, and when the
-// explanation already arrived in the language this bubble exists to reach her
-// in, skip the model call and answer "". The client seeds the bubble with the
-// explanation itself when the translation comes back empty, which is exactly
-// right — there is nothing to add.
+// So: render into whichever half the explanation is NOT already in — and that
+// is the whole rule, in both directions. When it first shipped this endpoint
+// answered "" for a Portuguese explanation on the reasoning that an English
+// rendering she hadn't asked for was noise. It was reported as the opposite: a
+// writer whose pair is Portuguese and English, learning English, met a
+// Portuguese card with a Portuguese bubble under it and no English anywhere on
+// the card. The tap is the one place the other language was promised, and the
+// half she is *practising* is exactly the half worth a tap.
+//
+// The bubble sits directly beneath the explanation inside the card, so between
+// the two the writer always has both languages, whichever way round the document
+// put them.
 func (h *Handler) translate(w http.ResponseWriter, r *http.Request) {
 	sugID := chi.URLParam(r, "id")
 
@@ -69,15 +76,14 @@ func (h *Handler) translate(w http.ResponseWriter, r *http.Request) {
 	// today; the alternative is a language column on every suggestion row, and the
 	// cost of being wrong is one bubble seeded in the language it was already in.
 	target := targetFor(pairLang, direction, docLang)
-	if target.Explain.Code == target.Pair.Code {
-		// Already in her language. The other half is English — the language she is
-		// practising — and an unasked-for English rendering of an explanation she
-		// can already read is not a seed, it's noise.
-		httputil.WriteJSON(w, http.StatusOK, translateResponse{Translation: ""})
-		return
+	from, to := target.Explain, target.Pair
+	if from.Code == to.Code {
+		// The explanation is already in her language, so the half this tap has to
+		// reach is the other one: the English she is practising.
+		to = llm.English
 	}
 
-	out, err := llm.RunTranslate(r.Context(), h.Client, explanation, target.Pair)
+	out, err := llm.RunTranslate(r.Context(), h.Client, explanation, from, to)
 	if err != nil {
 		httputil.UpstreamError(w, "translate", err)
 		return

web/src/App.tsx

@@ -118,7 +118,13 @@ export default function App() {
   // Mandarin native drafting English quotes Chinese constantly, and none of that
   // is what segmentation is for. Declared above the checkpoint because the
   // offline 错别字 pass reads it.
-  const segmenter = useSegmenter(me?.direction === 'learning_pair')
+  //
+  // Both halves of the gate matter now that Chinese is not the only pair with a
+  // learner direction. `learning_pair` alone used to imply zh; a writer learning
+  // Portuguese is also learning_pair and has no use for a megabyte of Chinese
+  // word list — nor for the hanzi hover it turns on, which would ask /api/hanzi
+  // about Portuguese words.
+  const segmenter = useSegmenter(me?.direction === 'learning_pair' && me?.pair_lang === 'zh')
 
   const {
     suggestions,

web/src/components/Companion/useCardOverlap.ts

@@ -17,7 +17,14 @@ const POLL_MS = 500
 const HOLD_PX = 24
 
 const CARD = '.petal-rail-card'
-const MODAL = '[role="dialog"][aria-modal="true"]'
+// The mobile sidebar drawer is named outright because it is the one overlay that
+// isn't a dialog. It slides over the page behind a scrim exactly as History and
+// Garden do, but it is the app's own navigation rather than something opened on
+// purpose, so it carries no modal role for the selector above to catch — and the
+// kitten sat in its bottom corner, over the last two rows of the language
+// picker. On a 390px phone that put "Español" and "I am learning Português"
+// under the halo: visibly there, and only partly tappable.
+const MODAL = '[role="dialog"][aria-modal="true"], .petal-sidebar.petal-drawer-open'
 
 export interface CardOverlap {
   // A suggestion card reaches the mascot. It should get out of the way, but may

web/src/components/Editor/AskPetal.tsx

@@ -5,12 +5,11 @@ import { splitBilingual } from './bilingualReply'
 import { fromIME } from '../../lib/ime'
 
 interface Props {
+  // The card's explanation is deliberately NOT passed in. Petal's opening
+  // bubble is that explanation rendered into the other half of the pair,
+  // fetched on open from this id — and when that can't be had, the panel has
+  // nothing to say rather than a second copy of the card.
   suggestionId: string
-  // The English explanation (shown in the card body). Petal's opening bubble is
-  // its translation into the pair language, fetched on open — so the panel
-  // doesn't just repeat the same English text twice. Falls back to this on
-  // failure.
-  explanation: string
 }
 
 // CJK fallback stack — Nunito has no Chinese glyphs, and on the zh pair both
@@ -44,10 +43,11 @@ const CHAT_MIN_PX = 160
 // conversation lives in this component's state — nothing is persisted; closing
 // the card (unmounting) clears it. Each send streams Petal's reply token-by-
 // token into the latest assistant bubble.
-export function AskPetal({ suggestionId, explanation }: Props) {
+export function AskPetal({ suggestionId }: Props) {
   const t = usePack()
-  // Opening bubble starts empty (caret-only) and fills with the pair-language
-  // translation once it lands; `seeding` drives that loading caret.
+  // Opening bubble starts empty (caret-only) and fills with the other half of
+  // the pair once it lands; `seeding` drives that loading caret, and the bubble
+  // goes away entirely if there turns out to be nothing to put in it.
   const [messages, setMessages] = useState<ChatMessage[]>([{ role: 'assistant', content: '' }])
   const [seeding, setSeeding] = useState(true)
   const [input, setInput] = useState('')
@@ -82,23 +82,31 @@ export function AskPetal({ suggestionId, explanation }: Props) {
     inputRef.current?.focus({ preventScroll: true })
   }, [])
 
-  // Fetch the pair-language translation of the explanation to seed the first
-  // bubble.
+  // Fetch the explanation rendered into the other half of her pair to seed the
+  // first bubble — English under a Portuguese card, her language under an
+  // English one; the server decides which way round (suggestions/translate.go).
   // Only replaces the seed bubble if the user hasn't started chatting yet (the
-  // conversation always opens with this one assistant turn). Falls back to the
-  // English explanation if the translation can't be fetched.
+  // conversation opens with this one assistant turn and nothing else).
+  //
+  // When it can't be fetched the panel opens empty rather than falling back to
+  // the explanation, which sits two lines higher in the card: a bubble that
+  // repeats the card verbatim reads as Petal answering in the language the tap
+  // was pressed to escape. Nothing to add, nothing shown.
   useEffect(() => {
     let cancelled = false
+    const seed = (text: string) =>
+      setMessages((prev) =>
+        prev.length !== 1 ? prev : text === '' ? [] : [{ role: 'assistant', content: text }],
+      )
     api
       .translateSuggestion(suggestionId)
       .then((res) => {
         if (cancelled) return
-        const text = res.translation.trim() || explanation
-        setMessages((prev) => (prev.length === 1 ? [{ role: 'assistant', content: text }] : prev))
+        seed(res.translation.trim())
       })
       .catch(() => {
         if (cancelled) return
-        setMessages((prev) => (prev.length === 1 ? [{ role: 'assistant', content: explanation }] : prev))
+        seed('')
       })
       .finally(() => {
         if (!cancelled) setSeeding(false)
@@ -106,7 +114,7 @@ export function AskPetal({ suggestionId, explanation }: Props) {
     return () => {
       cancelled = true
     }
-  }, [suggestionId, explanation])
+  }, [suggestionId])
 
   async function send() {
     const text = input.trim()

web/src/components/Editor/ChromeStrip.tsx

@@ -1,4 +1,4 @@
-import { useCallback, useEffect, useRef, useState } from 'react'
+import { useScrollEdge } from './useScrollEdge'
 
 // ChromeStrip is the row of document pills (tone, history, export) on a screen
 // too narrow to hold them. It scrolls within itself rather than letting the
@@ -15,7 +15,9 @@ import { useCallback, useEffect, useRef, useState } from 'react'
 // The fade is a mask rather than a gradient overlay so it works on whatever is
 // behind it (the cream page, the night theme, a falling petal) without knowing
 // the background colour.
-type Edge = 'none' | 'left' | 'right' | 'both'
+//
+// The measuring itself lives in useScrollEdge, shared with the formatting
+// toolbar — which has to say the same thing for the same reason.
 
 interface Props {
   className?: string
@@ -23,36 +25,7 @@ interface Props {
 }
 
 export function ChromeStrip({ className = '', children }: Props) {
-  const ref = useRef<HTMLDivElement>(null)
-  const [edge, setEdge] = useState<Edge>('none')
-
-  // A pixel of slack: scrollLeft is fractional under browser zoom and on
-  // high-DPI screens, so an exactly-scrolled-to-the-end strip can report
-  // something like 0.5px remaining and fade an edge that has nothing behind it.
-  const measure = useCallback(() => {
-    const el = ref.current
-    if (!el) return
-    const more = el.scrollWidth - el.clientWidth - el.scrollLeft > 1
-    const less = el.scrollLeft > 1
-    setEdge(less && more ? 'both' : less ? 'left' : more ? 'right' : 'none')
-  }, [])
-
-  useEffect(() => {
-    const el = ref.current
-    if (!el) return
-    measure()
-    el.addEventListener('scroll', measure, { passive: true })
-    // Both halves of "does it fit" can change without a scroll: the window
-    // resizes, or the labels themselves change when she switches her pair
-    // language and every pill in the row grows or shrinks at once.
-    const ro = new ResizeObserver(measure)
-    ro.observe(el)
-    for (const child of Array.from(el.children)) ro.observe(child)
-    return () => {
-      el.removeEventListener('scroll', measure)
-      ro.disconnect()
-    }
-  }, [measure])
+  const { ref, edge } = useScrollEdge<HTMLDivElement>()
 
   return (
     <div ref={ref} data-edge={edge} className={`petal-chrome-strip ${className}`}>

web/src/components/Editor/EditorCore.tsx

@@ -1582,6 +1582,7 @@ export function EditorCore({
             saved={wordInfo.saved}
             onToggleSave={toggleSaveWord}
             pinyin={wordInfo.pinyin}
+            lang={docLocale(wordInfo.word, docLang)}
             style={{ top: wordInfo.top, left: wordInfo.left }}
             onReplace={replaceWord}
           />

web/src/components/Editor/SuggestionCard.tsx

@@ -197,7 +197,7 @@ export function SuggestionCard({
         {asking ? 'Hide Petal' : 'Ask Petal ✨'}
       </button>
 
-      {asking && <AskPetal suggestionId={suggestion.id} explanation={suggestion.explanation} />}
+      {asking && <AskPetal suggestionId={suggestion.id} />}
 
       <div className="mt-3 flex items-center gap-2">
         {hasReplacement && (

web/src/components/Editor/SuggestionRail.tsx

@@ -217,7 +217,7 @@ const RailCard = forwardRef<HTMLDivElement, CardProps>(function RailCard(
         </span>
       </button>
 
-      {expanded && <AskPetal suggestionId={suggestion.id} explanation={suggestion.explanation} />}
+      {expanded && <AskPetal suggestionId={suggestion.id} />}
 
       <div className="mt-2.5 flex items-center gap-2">
         {hasReplacement && (

web/src/components/Editor/ToneSelect.tsx

@@ -1,4 +1,5 @@
 import { useEffect, useRef, useState } from 'react'
+import { createPortal } from 'react-dom'
 
 import { usePack } from '../../i18n'
 import { useAnchoredMenu } from './anchoredMenu'
@@ -36,18 +37,20 @@ export function ToneSelect({ value, onChange }: Props) {
   const pk = usePack()
   const [open, setOpen] = useState(false)
   const ref = useRef<HTMLDivElement>(null)
-  const { triggerRef, style: menuStyle } = useAnchoredMenu(open, 200)
+  const { triggerRef, panelRef, style: menuStyle } = useAnchoredMenu(open, 200)
   const current = TONES.find((t) => t.value === value) ?? TONES[0]
 
-  // Click outside closes the menu.
+  // Click outside closes the menu. The list is portalled to <body>, so a tap on
+  // an option is not inside `ref` and has to be asked about separately.
   useEffect(() => {
     if (!open) return
     const onDown = (e: MouseEvent) => {
-      if (!ref.current?.contains(e.target as Node)) setOpen(false)
+      const target = e.target as Node
+      if (!ref.current?.contains(target) && !panelRef.current?.contains(target)) setOpen(false)
     }
     document.addEventListener('mousedown', onDown)
     return () => document.removeEventListener('mousedown', onDown)
-  }, [open])
+  }, [open, panelRef])
 
   return (
     <div ref={ref} className="shrink-0">
@@ -75,8 +78,10 @@ export function ToneSelect({ value, onChange }: Props) {
         </span>
       </button>
 
-      {open && (
+      {open &&
+        createPortal(
         <div
+          ref={panelRef}
           role="listbox"
           className="petal-word-card p-1.5"
           style={{
@@ -117,7 +122,8 @@ export function ToneSelect({ value, onChange }: Props) {
               </button>
             )
           })}
-        </div>
+        </div>,
+        document.body,
       )}
     </div>
   )

web/src/components/Editor/WordCard.tsx

@@ -22,11 +22,31 @@ interface Props {
   // is spelled in letters, and the slashes would say something untrue about it
   // in the one place a learner is looking for the truth about pronunciation.
   pinyin?: string
+  // The locale to pronounce the headword in — the document's language, decided
+  // by the caller (see docLang in audio/speech.ts).
+  //
+  // It has to be passed rather than guessed. `speak` falls back to detecting the
+  // script, and that test can only tell Han characters from letters: it reads
+  // "comum" and "casa" as English, so every read-aloud in a Portuguese document
+  // came out in the English voice. That is the same mistake the "also in" block
+  // below was built to avoid, arriving through the one button nobody had told
+  // about the document.
+  lang?: string
   style: React.CSSProperties
   onReplace: (synonym: string) => void
 }
 
-export function WordCard({ word, info, loading, saved, onToggleSave, pinyin, style, onReplace }: Props) {
+export function WordCard({
+  word,
+  info,
+  loading,
+  saved,
+  onToggleSave,
+  pinyin,
+  lang,
+  style,
+  onReplace,
+}: Props) {
   const t = usePack()
   const definitions = info?.definitions ?? []
   const synonyms = info?.synonyms ?? []
@@ -90,7 +110,7 @@ export function WordCard({ word, info, loading, saved, onToggleSave, pinyin, sty
             <>
               <button
                 type="button"
-                onClick={() => speak(word)}
+                onClick={() => speak(word, lang)}
                 aria-label={`Pronounce ${word}`}
                 title={t.editor.readAloud}
                 className="flex h-7 w-7 items-center justify-center rounded-full text-sm"
@@ -104,7 +124,7 @@ export function WordCard({ word, info, loading, saved, onToggleSave, pinyin, sty
                   slowing the tape, so it stays a voice rather than a groan. */}
               <button
                 type="button"
-                onClick={() => speak(word, undefined, true)}
+                onClick={() => speak(word, lang, true)}
                 aria-label={`Pronounce ${word} slowly`}
                 title={t.editor.readSlowly}
                 className="flex h-7 w-7 items-center justify-center rounded-full text-sm"

web/src/components/Editor/anchoredMenu.ts

@@ -6,15 +6,40 @@ import { useLayoutEffect, useRef, useState, type CSSProperties } from 'react'
 // button's wrapper, which was fine until that wrapper became ChromeStrip — a
 // horizontal scroller, and so a box that clips what overflows it. An absolute
 // menu inside it is 36px tall and scrolls away with the pills. Positioning the
-// menu against the viewport instead takes it out of the strip's hands entirely:
-// nothing clips a fixed box unless an ancestor has a transform, and none of the
-// editor's chrome does.
+// menu against the viewport instead takes it out of the strip's hands entirely.
+//
+// Or rather: it does once the menu is also *portalled out* of it, which is the
+// part this originally got wrong. `position: fixed` is only relative to the
+// viewport while no ancestor establishes a containing block for it — and a
+// `mask-image` does, exactly like a transform. Both scrollers fade their edges
+// with a mask (that is how each says "there is more this way"), so on any screen
+// narrow enough for the fade to appear — i.e. every phone — the menu was pulled
+// back inside the very box it was trying to escape: painted underneath the
+// toolbar, and untappable. It looked open and did nothing.
+//
+// So the panel is rendered through a portal into <body>. Nothing above it can
+// clip it, stack over it, or contain it, whatever the chrome does with masks
+// later. `panelRef` is returned for the outside-tap test, which can no longer
+// rely on the panel being a DOM descendant of the trigger's wrapper.
 //
 // The trade is that a fixed box doesn't follow its anchor, so anything that
 // moves the button — the page scrolling under it, the strip scrolling, the
 // window resizing — has to re-place the menu.
-export function useAnchoredMenu(open: boolean, width: number) {
-  const triggerRef = useRef<HTMLButtonElement>(null)
+//
+// The element type is a parameter because the two kinds of caller anchor
+// against different things: the tone and export pills hand it their own
+// <button>, while the toolbar's popovers anchor against the wrapper that holds
+// trigger and panel together (it is that wrapper an outside-tap test already
+// asks about, so measuring anything else would be a second source of truth).
+export function useAnchoredMenu<T extends HTMLElement = HTMLButtonElement>(
+  open: boolean,
+  width: number,
+) {
+  const triggerRef = useRef<T>(null)
+  // The portalled panel. Attach it to the element the style is spread onto, so
+  // an outside-tap test can ask "was this inside the menu?" of a node that is no
+  // longer beneath the trigger in the tree.
+  const panelRef = useRef<HTMLDivElement>(null)
   // Nothing to place before the first measurement; keeping it off-screen rather
   // than at 0,0 means no flash in the top-left corner on open.
   const [style, setStyle] = useState<CSSProperties>({ position: 'fixed', top: -9999, left: -9999 })
@@ -41,5 +66,5 @@ export function useAnchoredMenu(open: boolean, width: number) {
     }
   }, [open, width])
 
-  return { triggerRef, style }
+  return { triggerRef, panelRef, style }
 }

web/src/components/Editor/useScrollEdge.ts

@@ -0,0 +1,51 @@
+import { useCallback, useEffect, useRef, useState } from 'react'
+
+// Which end of a horizontal scroller has more behind it.
+//
+// Extracted from ChromeStrip when the formatting toolbar needed the same
+// answer. Both rows are in the same situation and it is a harsher one than most
+// scrollers face: the row is the *only* way to reach what is in it, so a control
+// that has scrolled out of sight is indistinguishable from a control that does
+// not exist. Fading the edge that has more behind it is the one cue that tells
+// those two apart.
+//
+// The caller owns the element and the styling; this hook only measures. Apply
+// the returned `edge` as a `data-edge` attribute and let CSS decide what a
+// faded edge looks like — the two rows sit on different backgrounds and mask
+// themselves at slightly different insets.
+export type Edge = 'none' | 'left' | 'right' | 'both'
+
+export function useScrollEdge<T extends HTMLElement = HTMLDivElement>() {
+  const ref = useRef<T>(null)
+  const [edge, setEdge] = useState<Edge>('none')
+
+  // A pixel of slack: scrollLeft is fractional under browser zoom and on
+  // high-DPI screens, so an exactly-scrolled-to-the-end strip can report
+  // something like 0.5px remaining and fade an edge that has nothing behind it.
+  const measure = useCallback(() => {
+    const el = ref.current
+    if (!el) return
+    const more = el.scrollWidth - el.clientWidth - el.scrollLeft > 1
+    const less = el.scrollLeft > 1
+    setEdge(less && more ? 'both' : less ? 'left' : more ? 'right' : 'none')
+  }, [])
+
+  useEffect(() => {
+    const el = ref.current
+    if (!el) return
+    measure()
+    el.addEventListener('scroll', measure, { passive: true })
+    // Both halves of "does it fit" can change without a scroll: the window
+    // resizes, or the labels themselves change when she switches her pair
+    // language and every control in the row grows or shrinks at once.
+    const ro = new ResizeObserver(measure)
+    ro.observe(el)
+    for (const child of Array.from(el.children)) ro.observe(child)
+    return () => {
+      el.removeEventListener('scroll', measure)
+      ro.disconnect()
+    }
+  }, [measure])
+
+  return { ref, edge }
+}

web/src/components/Export/ExportMenu.tsx

@@ -1,4 +1,5 @@
 import { useEffect, useRef, useState } from 'react'
+import { createPortal } from 'react-dom'
 import { api, type ExportFormat } from '../../api/client'
 import { usePack } from '../../i18n'
 import { useAnchoredMenu } from '../Editor/anchoredMenu'
@@ -29,16 +30,20 @@ export function ExportMenu({ docId }: Props) {
   const t = usePack()
   const [open, setOpen] = useState(false)
   const ref = useRef<HTMLDivElement>(null)
-  const { triggerRef, style: menuStyle } = useAnchoredMenu(open, 220)
+  const { triggerRef, panelRef, style: menuStyle } = useAnchoredMenu(open, 220)
 
+  // The menu is portalled to <body>, so a tap on a format is outside `ref` and
+  // has to be asked about separately or it would close the menu instead of
+  // exporting.
   useEffect(() => {
     if (!open) return
     const onDown = (e: MouseEvent) => {
-      if (!ref.current?.contains(e.target as Node)) setOpen(false)
+      const target = e.target as Node
+      if (!ref.current?.contains(target) && !panelRef.current?.contains(target)) setOpen(false)
     }
     document.addEventListener('mousedown', onDown)
     return () => document.removeEventListener('mousedown', onDown)
-  }, [open])
+  }, [open, panelRef])
 
   return (
     <div ref={ref} className="shrink-0">
@@ -63,8 +68,10 @@ export function ExportMenu({ docId }: Props) {
         <span style={{ color: 'var(--color-muted)' }}>· Export</span>
       </button>
 
-      {open && (
+      {open &&
+        createPortal(
         <div
+          ref={panelRef}
           role="menu"
           className="petal-word-card p-1.5"
           style={{
@@ -116,7 +123,8 @@ export function ExportMenu({ docId }: Props) {
               Print / PDF
             </span>
           </button>
-        </div>
+        </div>,
+        document.body,
       )}
     </div>
   )

web/src/components/Toolbar/Toolbar.tsx

@@ -1,7 +1,10 @@
 import type { Editor } from '@tiptap/react'
 import { useEditorState } from '@tiptap/react'
 import { useEffect, useRef, useState } from 'react'
+import { createPortal } from 'react-dom'
 import { uploadImageInto } from '../Editor/EditorCore'
+import { useAnchoredMenu } from '../Editor/anchoredMenu'
+import { useScrollEdge } from '../Editor/useScrollEdge'
 import { usePack } from '../../i18n'
 
 interface Props {
@@ -56,9 +59,26 @@ const Divider = () => (
   <span className="mx-1 h-5 w-px" style={{ background: 'var(--color-border)' }} />
 )
 
-// A popover anchored under its trigger. The trigger + panel share a relative
-// wrapper; `open`/`onClose` are owned by the toolbar so only one is open at once.
-// A pointer-down outside the wrapper closes it.
+// A popover anchored under its trigger. The trigger + panel share a wrapper;
+// `open`/`onClose` are owned by the toolbar so only one is open at once. A
+// pointer-down outside the wrapper closes it.
+//
+// The panel is placed in viewport coordinates rather than absolutely inside
+// that wrapper, for the same two reasons ChromeStrip's menus were (see
+// useAnchoredMenu) — and on a phone both of them bite at once:
+//
+//   * The toolbar clips what overflows it. On a desktop that clip is lifted on
+//     hover, which is where an absolutely-positioned panel got away with it for
+//     as long as it did; a touchscreen never hovers, so tapping A or H opened a
+//     panel that was simply not on the screen. The button lit up and nothing
+//     else happened, which is the worst shape a bug can take — it reads as the
+//     feature not existing.
+//   * `left-0` hangs a 200px panel off the right edge of a 390px phone when its
+//     trigger sits near the end of the row. useAnchoredMenu clamps it back
+//     inside the window instead.
+//
+// The panel stays a DOM child of the wrapper (fixed, not portalled) so the
+// outside-tap test below keeps working on containment alone.
 function Popover({
   open,
   onClose,
@@ -72,23 +92,27 @@ function Popover({
   children: React.ReactNode
   width?: number
 }) {
-  const ref = useRef<HTMLDivElement>(null)
+  const { triggerRef: ref, panelRef, style } = useAnchoredMenu<HTMLDivElement>(open, width)
   useEffect(() => {
     if (!open) return
     const onDown = (e: MouseEvent) => {
-      if (!ref.current?.contains(e.target as Node)) onClose()
+      const target = e.target as Node
+      // The panel is portalled to <body>, so "inside" is either half.
+      if (!ref.current?.contains(target) && !panelRef.current?.contains(target)) onClose()
     }
     document.addEventListener('mousedown', onDown)
     return () => document.removeEventListener('mousedown', onDown)
-  }, [open, onClose])
+  }, [open, onClose, ref, panelRef])
   return (
-    <div ref={ref} className="relative flex items-center">
+    <div ref={ref} className="flex items-center">
       {trigger}
-      {open && (
+      {open &&
+        createPortal(
           <div
-          className="absolute left-0 top-full z-40 mt-1.5 p-2"
+            ref={panelRef}
+            className="p-2"
             style={{
-            width,
+              ...style,
               borderRadius: 'var(--radius-card)',
               background: 'var(--color-surface)',
               border: '1px solid var(--color-border)',
@@ -96,7 +120,8 @@ function Popover({
             }}
           >
             {children}
-        </div>
+          </div>,
+          document.body,
         )}
     </div>
   )
@@ -175,6 +200,10 @@ export function Toolbar({ editor, onVoiceCheck, voicing, onCollocationCheck, col
   const [menu, setMenu] = useState<'color' | 'highlight' | 'size' | 'link' | 'table' | 'outline' | null>(null)
   const [linkUrl, setLinkUrl] = useState('')
   const fileInputRef = useRef<HTMLInputElement>(null)
+  // Which end of the row still has controls behind it. Only ever visible on a
+  // coarse pointer, where the row scrolls instead of expanding on hover — see
+  // the .petal-toolbar rules in index.css.
+  const { ref: toolbarRef, edge } = useScrollEdge<HTMLDivElement>()
 
   const state = useEditorState({
     editor,
@@ -255,6 +284,8 @@ export function Toolbar({ editor, onVoiceCheck, voicing, onCollocationCheck, col
 
   return (
     <div
+      ref={toolbarRef}
+      data-edge={edge}
       className="petal-toolbar mb-4 flex items-center gap-0.5 self-start px-2 py-1.5"
       style={{
         borderRadius: 'var(--radius-card)',

web/src/i18n/packs/pt-PT.ts

@@ -42,6 +42,25 @@ export const ptPT: Pack = {
   nativeName: 'Português',
   locale: 'pt-PT',
 
+  // pt-PT is the second pair Petal can be *learned* toward: spaces do the
+  // segmenting a Latin script needs, and dict.db already reads Portuguese into
+  // English (see auth.learnerPairs for both halves of that argument).
+  //
+  // Each label is written for whoever would pick it, which is why they are not
+  // in the same language as each other. A native Portuguese speaker practising
+  // English reads the first; an English speaker learning Portuguese reads the
+  // second, and would not be helped by being told "Português" in Portuguese.
+  //
+  // This is also the switch that decides which language Petal *explains* in, so
+  // it is the difference between a Portuguese document annotated in Portuguese
+  // and the same document annotated in English.
+  learner: {
+    label: 'Estou a aprender · I am learning',
+    toEn: 'inglês',
+    toPair: 'Portuguese',
+    failed: 'Não foi possível mudar · Couldn’t switch — nothing changed',
+  },
+
   app: {
     duplicateTitle: (title) => `${title} (cópia)`,
     garden: 'Jardim de palavras',

web/src/index.css

@@ -564,6 +564,64 @@ button, a, input {
     padding-top: 0.25rem;
     padding-bottom: 0.25rem;
   }
+
+  /* The formatting toolbar reaches everything it holds by expanding on hover
+     (see .petal-toolbar above). A touchscreen never hovers, so that rule never
+     fired here and the row stayed clipped at `overflow: hidden` for good: on a
+     390px phone roughly 750px of it — every heading, both lists, all three
+     alignments, link, image, table, outline, and both AI passes — could not be
+     reached at all. The faded edge said "there is more this way" and there was
+     no way.
+
+     So on a coarse pointer the row does what the pill strip does one line
+     above it: keeps every control and scrolls sideways, but only itself.
+     overscroll-behavior stops a swipe that runs out of buttons from dragging
+     the page of writing along with it, and the scrollbar is hidden because a
+     half-visible button at the edge is the affordance. The panels that hang off
+     these buttons are placed in viewport coordinates (see Popover in
+     Toolbar.tsx), so nothing here clips them. */
+  .petal-toolbar {
+    overflow-x: auto;
+    overflow-y: hidden;
+    overscroll-behavior-x: contain;
+    scrollbar-width: none;
+    -ms-overflow-style: none;
+    -webkit-mask-image: none;
+    mask-image: none;
+  }
+  .petal-toolbar::-webkit-scrollbar {
+    display: none;
+  }
+  /* :hover can still be reported on a touchscreen — a tap leaves a lingering
+     hover state on the last thing touched — and the desktop rule would answer
+     it by unwrapping the row mid-scroll. Hold the scrolling shape instead. */
+  .petal-toolbar:hover,
+  .petal-toolbar:focus-within {
+    flex-wrap: nowrap;
+    overflow-x: auto;
+    overflow-y: hidden;
+  }
+  /* Which edge has more behind it, from the same measurement the pill strip
+     uses (useScrollEdge → data-edge). A row whose buttons all fit is left
+     unmasked, so the fade only ever appears when it means something. */
+  .petal-toolbar[data-edge='right'] {
+    -webkit-mask-image: linear-gradient(to right, #000 92%, transparent 100%);
+    mask-image: linear-gradient(to right, #000 92%, transparent 100%);
+  }
+  .petal-toolbar[data-edge='left'] {
+    -webkit-mask-image: linear-gradient(to left, #000 92%, transparent 100%);
+    mask-image: linear-gradient(to left, #000 92%, transparent 100%);
+  }
+  .petal-toolbar[data-edge='both'] {
+    -webkit-mask-image: linear-gradient(
+      to right,
+      transparent 0%,
+      #000 8%,
+      #000 92%,
+      transparent 100%
+    );
+    mask-image: linear-gradient(to right, transparent 0%, #000 8%, #000 92%, transparent 100%);
+  }
 }
 
 /* --- Responsive sidebar (narrow screens) ------------------------------------
@@ -604,6 +662,17 @@ button, a, input {
     z-index: 20;
     background: rgba(61, 46, 57, 0.18);
   }
+
+  /* Sit the mascot above the status bar rather than on top of it.
+     --petal-companion-size bottoms out at 9rem, which is most of a phone's
+     width, and at `bottom-4` the bottom of that circle lands inside the 2.75rem
+     status bar — directly over "Hide falling petals", which could not be tapped
+     at all. The kitten yields to cards and panels (useCardOverlap) but the
+     status bar is neither: it is always there, so yielding to it would mean
+     fading forever. Moving up once is the honest fix. */
+  .petal-corner {
+    bottom: calc(2.75rem + 0.5rem);
+  }
 }
 
 /* Small phones only: see the header in App.tsx for why the wordmark yields.