refactor(web): migrate local storage access to react hook

[lyzno1]

Summary

• add the foxact-style local storage hook and keep its public API aligned with upstream
• bridge workflow localStorage persistence through a React boundary instead of direct store initialization hacks
• migrate remaining web local-storage utility call sites to useLocalStorage/useSetLocalStorage and remove web/utils/local-storage.ts

Validation

• vpr lint --fix --pass-on-unpruned-suppressions web/app/... web/hooks/use-local-storage/index.ts
• pnpm -C web test app/components/header/tests/header-wrapper.spec.tsx app/components/header/tests/maintenance-notice.spec.tsx 'app/(commonLayout)/datasets/(datasetDetailLayout)/[datasetId]/tests/layout-main.spec.tsx' app/components/workflow/persistence/tests/local-storage-bridge.spec.tsx hooks/use-local-storage/tests/index.spec.tsx app/education-apply/tests/search-input.spec.tsx tests/billing/education-verification-flow.test.tsx
• pnpm -C web type-check

[codecov]

Codecov Report

❌ Patch coverage is 92.02128% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.81%. Comparing base (becccbf) to head (d23eddc).

Files with missing lines	Patch %	Lines
web/hooks/use-local-storage/index.ts	92.66%	8 Missing ⚠️
.../(datasetDetailLayout)/[datasetId]/layout-main.tsx	66.66%	2 Missing ⚠️
web/app/components/workflow/index.tsx	81.81%	2 Missing ⚠️
...components/workflow/store/workflow/layout-slice.ts	66.66%	2 Missing ⚠️
...ents/workflow/persistence/local-storage-bridge.tsx	97.22%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main   #36888    +/-   ##
========================================
  Coverage   85.80%   85.81%            
========================================
  Files        4559     4562     +3     
  Lines      223152   223257   +105     
  Branches    41073    41095    +22     
========================================
+ Hits       191478   191584   +106     
+ Misses      27971    27970     -1     
  Partials     3703     3703            

Flag	Coverage Δ
dify-ui	95.57% <ø> (ø)
web	86.47% <92.02%> (+0.01%)	⬆️

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