Changelog: July 24 feature wave integrated into main / 七月廿四功能潮合併入主幹

[DingDingChae]

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Pushed commit: f9e07c9c42 (main, 15 commits: 6 merges + integration/receipt commits)

What landed / 今次上咗乜

• Settings search — searchable catalog over every Preferences tab (fuzzy/substring/regex, EN + 粵語, match badges, keyboard + screen-reader accessible).
• Tab-strip overflow dropdown — overflowing repository tabs collapse into an accessible "more tabs" dropdown; active tab always stays visible.
• Optional audio system — off-by-default TTS narrator (EN / 粵語 / both), synthesized SFX, per-repo music, quiet hours, reduced-sound and screen-reader coexistence; new Settings → Sound pane, indexed in settings search.
• Narration/melody assets — 243 pre-generated MP3/WAV files + manifest for 82 events (runtime wiring is a tracked follow-up).
• Local GitHub Actions runner — Repository ▸ Run actions locally… via act + Docker: streaming logs, dispatch inputs, ephemeral secrets, dry-run, cancel with container-tree teardown.
• Commit/push batching (Changelog history: M24 — Guided sparse checkout · 「揀住 checkout」 #14) — dual per-batch caps (10k files / 1.4 GB), detailed per-batch commit progress, per-batch proven pushes, auto-gc/maintenance isolation for huge commits.
• Contract tests updated honestly to the post-merge shapes; responsive surface catalog now gates the Sound tab (87 → 88 surfaces).

Verification / 驗收

• npx tsc --noEmit clean; full node script/test.mjs green after fixes (final failing suite re-run 7/7).
• Ultracode adversarial review panel (6 dimensions × Opus, 2 refuters per finding): all code dimensions clean; 2 minor doc inaccuracies found and fixed pre-push.

Remote checks (running, not yet verified):

• CI 30112766021 — running
• CodeQL 30112766133 — running
• Deploy Pages 30112766262 — running

Merged source branches were verified as ancestors of the pushed main and then deleted (local + origin). A second changelog will follow the in-flight "mega wave" (narration wiring, SFX mapping, repo-themed music, auto-fix errors, native large-repo handling) when it integrates and pushes.
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