refactor(web): migrate tag controls to combobox

[lyzno1]

Summary

• migrate tag selector and tag filter surfaces to the Dify UI combobox primitives
• keep tag search input clearing scoped to the query while preserving selected tags
• improve related focus affordances for app cards and tooltip/focus interactions

Part of #35867

Tests

• pnpm --dir web test tag-filter.spec.tsx tag-panel.spec.tsx tag-selector.spec.tsx
• pnpm --dir web test app-card.spec.tsx
• pnpm --dir web type-check

[codecov]

Codecov Report

❌ Patch coverage is 97.05882% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.82%. Comparing base (8b77ec7) to head (affdb0b).

Files with missing lines	Patch %	Lines
...eatures/tag-management/components/tag-selector.tsx	94.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #35881      +/-   ##
==========================================
- Coverage   85.83%   85.82%   -0.01%     
==========================================
  Files        4462     4463       +1     
  Lines      209146   209159      +13     
  Branches    39125    39116       -9     
==========================================
+ Hits       179512   179520       +8     
- Misses      26458    26463       +5     
  Partials     3176     3176              

Flag	Coverage Δ
dify-ui	93.93% <ø> (ø)
web	86.77% <97.05%> (-0.01%)	⬇️

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