chore(plans): archive completed plans + add next-session todo

- Move all 8 completed plans (260426-* and 260427-*) into
  plans/archive/ to keep the active plans/ dir uncluttered.
- Add plans/todo.md as a hand-off list for next session: highest
  leverage items first (auto-tick integration test, CI inline-script
  smoke check, PWA install verification), then UX polish queued from
  pass-2 reviews, tech-debt items, and a parking-lot of new features.

plans/todo.md

@@ -0,0 +1,81 @@
+# Next-session TODO
+
+Hand-off list as of 2026-04-27 (commit `ee71bf0`). Two pass-2 reviews
+finished; below are items deferred for future cuts. None are blocking.
+
+## Highest leverage (start here)
+
+- **Test the auto-tick effect.** No integration test for
+  `PlayerBoard.svelte` bus-driven marking. The dedup-by-`at` fix is the
+  highest-risk uncovered code path — caught one P0 already, easy to
+  regress. See `plans/archive/260427-1036-three-mode-and-master-auto-tick/`
+  for context.
+- **CI smoke check for inline scripts in built `index.html`.** SvelteKit
+  emits one inline bootstrap script; we relaxed CSP to `'unsafe-inline'`
+  to accommodate it. If a future SvelteKit change adds another inline
+  block, we want to notice — `grep -c '<script>' build/index.html` in CI.
+- **Verify PWA install live.** Lighthouse PWA = 100/100 + manual install
+  test on Android Chrome and iOS Safari. Splash + theme color flow.
+  `BUILD_PROFILE=gh` deploy under `/loto/` base — confirm SW + manifest
+  paths still resolve.
+
+## UX polish (queued from pass-2)
+
+- **Mode picker glyphs read unevenly.** Player rect = clear. Megaphone
+  = abstract. "Both" two stacked rectangles = looks like windows, not
+  roles. Redesign or add tiny role labels under each glyph.
+- **`MasterEmptyState` ↔ PlayerBoard ghost-grid duplication.** Two
+  near-identical decorative components — extract a shared
+  `<GhostBoardPreview rows={N} />` if a third use appears.
+- **Settings modal on iPhone SE.** Title + footer scroll off — make the
+  `<h2>` and the bottom button row sticky so the user can always close
+  the modal without scrolling all the way back.
+- **Tier-2 confetti threshold.** 3+ row bingos on a 9-row card is rare;
+  consider triggering tier 2 on the 2nd bingo, or after a bingo + Chờ.
+- **Confetti emoji variety.** Add 🥢 🎋 🏮 to mix the all-celebration
+  set. Randomize size 1.5–2.5rem.
+- **Per-row "Chờ" visual indicator.** Subtle ring/glow on the
+  `section-label` band when a Chờ row exists in that section — reduces
+  reliance on the toast.
+
+## Tech debt
+
+- **Strict CSP via hashed inline script.** Today we ship
+  `script-src 'self' 'unsafe-inline'`. Computing the SHA-256 of
+  SvelteKit's bootstrap inline at build time and adding it to CSP
+  would close the relaxation. Brittle: hash changes per build. Worth
+  tooling if we want a real CSP grade.
+- **LRU on audio cache.** Workbox already enforces `maxEntries: 400`,
+  but a "drop voices not used in 30 days" rule would be nicer than
+  age-only. Only matters at voices > 10.
+- **`cookie` override is a temporary patch.** Remove the override
+  block in `package.json` once `@sveltejs/kit` ships a release with
+  `cookie >= 0.7.0` upstream. Same for `serialize-javascript@^7.0.5`
+  once `workbox-build` updates.
+- **Maskable icon at 70% safe-zone.** Verify in Chrome DevTools
+  "Show maskable preview" before announcing PWA. May need to drop to
+  65% if Android shape masks crop too tight.
+- **Voice list growth.** If we add voices > 2 (esp. > 10), revisit the
+  precache strategy — currently we precache only the default voice.
+
+## New features (parking lot)
+
+- Multiple cards per player.
+- Long-press hero to undo last call (master).
+- Spacebar to draw next number (master power-user shortcut).
+- Internationalization (English UI). Vi default; en strings in a flat
+  map. Maybe pick `paraglide-js` or roll our own minimal map.
+- "New version available" reload toast for SW autoUpdate. Today the
+  swap is silent; if users complain about content jumping mid-game,
+  add a non-blocking notice.
+
+## Reports archive
+
+- Pass 1 (260427-1151): `code-reviewer-`, `ui-ux-designer-`, `security-`
+- Pass 2 (260427-2047): `code-reviewer-pass2-full`,
+  `ui-ux-designer-pass2-full`, `security-pass2-full`
+- Phase-specific: `code-reviewer-260427-1036-three-mode`,
+  `code-reviewer-260427-2030-polish-pwa`
+
+All under `plans/reports/`. Pass-1 unresolved items were verified
+addressed in pass-2.