feat(app): place search, bigger tab icons, update-check button (v0.5.0)

- TopSearch now queries /api/place (debounced 300ms): type "고마도방파제"
  and pick the result to load tide at that coordinate. Official stations
  still shown first (⚓ 관측소 tag) for exact-datum tide; Kakao places below
  with address; 📍 current-location stays.
- Tab icons enlarged 27->34px (tabbar 66->74px) per feedback that they were
  still small; labels slightly larger.
- My Spots: "🔄 업데이트 확인" button — checkUpdate() on demand, shows
  "최신 버전입니다 ✓" or "새 버전 vX 있음 [받기]". The auto-check banner only
  appears when a newer version exists; this makes the feature visible/usable
  even when already up to date (the user thought it was missing).
- types/api gain Place + api.place.

Constraint: place search depends on the proxy Kakao key; on failure the dropdown just shows stations + the GPS hint, never blocking.
Confidence: high
Scope-risk: module
Reversibility: trivial
Directive: If users want named favorites of Kakao places, persist the chosen coordinate spot's name (already carried via coordSpot name).
Tested: app build clean; APK deployed (v0.5.0); Playwright mobile view confirms bigger icons, brighter UI, search dropdown with station+place results.
Not-tested: on-device; update-check button visual (logic verified, same checkUpdate path as the banner).
Related: docs/BACKLOG.md 0

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