refactor: migrate checkbox to dify-ui

[lyzno1]

Summary

• Migrated all non-group checkboxes in web to @langgenius/dify-ui/checkbox
• Removed the legacy web/app/components/base/checkbox implementation, tests, and stories to consolidate on the new primitive
• Aligned controlled APIs with Base UI semantics by standardizing on checked, onCheckedChange, and indeterminate
• Cleaned up legacy compatibility props such as onCheck, ariaLabel, and ariaLabelledBy, replacing them with native label composition patterns or aria-label only where necessary
• Refactored several call sites to improve label/clickable composition and reduce mechanical toggle patterns

Testing

• pnpm --dir packages/dify-ui test src/checkbox src/checkbox-group
• pnpm --dir web type-check
• pnpm --dir web test ... covering representative migration scenarios including dataset, plugin, form, annotation, and install flow related cases

[codecov]

Codecov Report

❌ Patch coverage is 93.67089% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.93%. Comparing base (1925d58) to head (a08a7dc).

Files with missing lines	Patch %	Lines
web/app/components/app/annotation/list.tsx	83.33%	1 Missing ⚠️
...figuration/config-var/config-modal/form-fields.tsx	75.00%	1 Missing ⚠️
...e/step-two/components/general-chunking-options.tsx	88.88%	1 Missing ⚠️
...documents/detail/completed/components/menu-bar.tsx	50.00%	1 Missing ⚠️
...tasets/documents/detail/completed/segment-list.tsx	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #36295      +/-   ##
==========================================
- Coverage   85.94%   85.93%   -0.01%     
==========================================
  Files        4458     4456       -2     
  Lines      211298   211260      -38     
  Branches    39503    39487      -16     
==========================================
- Hits       181593   181556      -37     
+ Misses      26501    26500       -1     
  Partials     3204     3204              

Flag	Coverage Δ
dify-ui	94.59% <ø> (ø)
web	86.55% <93.67%> (-0.01%)	⬇️

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