Add per-story views, trending, and reader reading-experience upgrades

Surface read counts and sharpen the reader:
- story_views table + RecordStoryView on /api/article (background,
  filter-guarded); "Popular this week" home rail via TrendingStories;
  read-count badge and reading-time chip decorated onto every listing
- reader: signed-in-only read-aloud (TTS), native share/copy, and an
  Aa typography popover (size/serif/sepia) persisted per device
- real alt text on card/reader/related/search images; time-of-day Pete
  greeting on the home hero
- harden exec() to skip (not panic) on a nil DB so background writes
  can't crash on a closed handle

Tests: story_views_test.go, trending_test.go. Suite green, CSS rebuilt.

internal/web/trending_test.go

@@ -0,0 +1,69 @@
+package web
+
+import (
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
+	"net/http/httptest"
+
+	"pete/internal/config"
+	"pete/internal/storage"
+)
+
+// TestIndexTrendingAndBadges seeds a story with captured content and some reader
+// views, then asserts the home page renders the "Popular this week" rail plus the
+// per-card reading-time chip and read-count badge that decorate() fills in.
+func TestIndexTrendingAndBadges(t *testing.T) {
+	storage.Close()
+	if err := storage.Init(filepath.Join(t.TempDir(), "trending.db")); err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { storage.Close() })
+
+	// ~1200 chars of body → about a 1 min read.
+	body := strings.Repeat("word ", 240)
+	story := &storage.Story{
+		GUID:       "trend-e2e",
+		Headline:   "A Trending Headline",
+		Lede:       "Lede.",
+		Content:    body,
+		ArticleURL: "https://example.com/trend",
+		Source:     "Example Wire",
+		Channel:    "tech",
+		Classified: true,
+		SeenAt:     time.Now().Unix(),
+	}
+	if err := storage.InsertStory(story); err != nil {
+		t.Fatal(err)
+	}
+	var id int64
+	if err := storage.Get().QueryRow(`SELECT id FROM stories WHERE guid = ?`, story.GUID).Scan(&id); err != nil {
+		t.Fatal(err)
+	}
+	// Two reads so the story trends and the badge shows a count.
+	storage.RecordStoryView(id)
+	storage.RecordStoryView(id)
+
+	s, err := New(config.WebConfig{SiteTitle: "Pete", ListenAddr: ":0"}, nil, true)
+	if err != nil {
+		t.Fatal(err)
+	}
+	rw := httptest.NewRecorder()
+	s.handleIndex(rw, httptest.NewRequest("GET", "/", nil))
+	if rw.Code != 200 {
+		t.Fatalf("index status = %d", rw.Code)
+	}
+	body = rw.Body.String()
+
+	for _, want := range []string{
+		"Popular this week", // trending rail heading
+		"min read",          // reading-time chip
+		`title="2 reads"`,   // view-count badge
+	} {
+		if !strings.Contains(body, want) {
+			t.Errorf("index HTML missing %q", want)
+		}
+	}
+}