refactor(web): migrate annotation selection to checkbox group

[lyzno1]

Summary

• Migrated the annotation list multi-selection logic to @langgenius/dify-ui/checkbox-group, unifying the header “select all” and row selection states
• Consolidated the bulk action bar cancel behavior into selection state updates, removing handwritten state branches
• Adjusted the hover spacing around the annotation config button area to make action button interaction states feel more natural
• Updated related tests to cover the new selection and cancel behaviors

Testing

• Added and updated unit tests for the annotation components
• Verified locally: related tests, type checking, and formatting checks all pass

[codecov]

Codecov Report

❌ Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.96%. Comparing base (2d5186f) to head (802e0c0).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
web/app/components/app/annotation/list.tsx	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #36370      +/-   ##
==========================================
- Coverage   85.96%   85.96%   -0.01%     
==========================================
  Files        4455     4455              
  Lines      211543   211532      -11     
  Branches    39527    39521       -6     
==========================================
- Hits       181847   181837      -10     
+ Misses      26482    26481       -1     
  Partials     3214     3214              

Flag	Coverage Δ
dify-ui	94.59% <ø> (ø)
web	86.55% <94.11%> (-0.01%)	⬇️

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