Fix push-digest sentinel filter, watermark, and cleanups from review

- push digest queries now exclude _duplicate channel like every other
  visibility query (bookmarks list/count and NewClassifiedSince)
- advance push watermark to newest scanned story, not pass-start now, so
  stories arriving during a long send pass aren't re-counted next pass
- replace hand-rolled escapeHTMLText with stdlib html.EscapeString
- drop em-dashes from user-facing copy; bump PWA CACHE_VERSION so clients
  pick up the changed shell assets

internal/web/feed.go

@@ -3,6 +3,7 @@ package web
 import (
 	"encoding/json"
 	"encoding/xml"
+	"html"
 	"log/slog"
 	"net/http"
 	"strings"
@@ -284,20 +285,8 @@ func contentToHTML(text string) string {
 			continue
 		}
 		b.WriteString("<p>")
-		b.WriteString(strings.ReplaceAll(escapeHTMLText(para), "\n", "<br>"))
+		b.WriteString(strings.ReplaceAll(html.EscapeString(para), "\n", "<br>"))
 		b.WriteString("</p>")
 	}
 	return b.String()
 }
-
-// escapeHTMLText escapes the five characters that matter inside HTML text so the
-// article body can't inject markup into content:encoded.
-func escapeHTMLText(s string) string {
-	return strings.NewReplacer(
-		"&", "&amp;",
-		"<", "&lt;",
-		">", "&gt;",
-		`"`, "&#34;",
-		"'", "&#39;",
-	).Replace(s)
-}

internal/web/push_sender.go

@@ -56,7 +56,6 @@ func (s *Server) sendDigests() {
 	if len(subs) == 0 {
 		return
 	}
-	now := time.Now().Unix()
 	// Disabled-source sets are per user; cache within a pass so a user with
 	// several devices only parses prefs once.
 	disabledByUser := make(map[string]map[string]bool)
@@ -116,7 +115,11 @@ func (s *Server) sendDigests() {
 			slog.Warn("push: send failed", "sub", sub.UserSub, "err", err)
 			continue
 		}
-		if derr := storage.TouchPushSubscription(sub.Endpoint, now); derr != nil {
+		// Advance to the newest story this digest actually accounted for, not a
+		// pass-start "now": the loop can run for minutes (one slow endpoint per
+		// send), so stories arriving mid-pass would otherwise be re-counted next
+		// pass. stories[0] is the newest in the scanned window (seen_at DESC).
+		if derr := storage.TouchPushSubscription(sub.Endpoint, stories[0].SeenAt); derr != nil {
 			slog.Error("push: advance watermark failed", "err", derr)
 		}
 		sent++
@@ -133,7 +136,7 @@ func buildDigestPayload(count int, top string) []byte {
 		body = "1 new story"
 	}
 	if top != "" {
-		body += " — " + top
+		body += ": " + top
 	}
 	b, _ := json.Marshal(map[string]string{
 		"title": "Pete has fresh news",

internal/web/static/js/pwa.js

@@ -101,7 +101,7 @@
         if (sub) return unsubscribe().then(function () { paint(false, "Notifications off."); });
         return Notification.requestPermission().then(function (perm) {
           if (perm !== "granted") { paint(false, "Permission denied."); return; }
-          return subscribe().then(function () { paint(true, "You're all set — new stories will nudge you."); });
+          return subscribe().then(function () { paint(true, "You're all set. New stories will nudge you."); });
         });
       }).catch(function () {
         paint(false, "Something went wrong. Try again.");

internal/web/static/js/reader.js

@@ -242,7 +242,7 @@
       : "";
     var href = safeURL(it.url);
     var note = '<p class="pete-reader-note">' +
-      (it.paywalled ? "This source is paywalled — the text above may be partial. " : "") +
+      (it.paywalled ? "This source is paywalled, so the text above may be partial. " : "") +
       (href ? 'Read it at the source: <a href="' + escapeHTML(href) + '" target="_blank" rel="noopener noreferrer">' +
               escapeHTML(it.source || "original article") + " ↗</a>." : "") +
       "</p>";

internal/web/static/sw.js

@@ -4,7 +4,7 @@
 //
 // Bump CACHE_VERSION whenever the precached shell assets change; activate()
 // drops every cache that doesn't match the current version.
-var CACHE_VERSION = "v2";
+var CACHE_VERSION = "v3";
 var SHELL_CACHE = "pete-shell-" + CACHE_VERSION;
 var RUNTIME_CACHE = "pete-runtime-" + CACHE_VERSION;
 
@@ -77,7 +77,7 @@ function offlineFallback() {
       "<div style=\"font-family:system-ui,sans-serif;max-width:32rem;margin:20vh auto;padding:0 1.5rem;text-align:center;color:#3a2f1a\">" +
       "<div style=font-size:3rem>🦆</div>" +
       "<h1 style=font-size:1.4rem>You're offline</h1>" +
-      "<p style=opacity:.7>Pete can't reach the news right now. Articles you've already opened are still readable — head back and try one of those.</p>" +
+      "<p style=opacity:.7>Pete can't reach the news right now. Articles you've already opened are still readable, so head back and try one of those.</p>" +
       "</div>",
     { headers: { "Content-Type": "text/html; charset=utf-8" }, status: 503 }
   );