refactor(web): decouple detail sidebars from main nav

[hyoban]

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2. Ensure there is an associated issue and you have been assigned to it
3. Use the correct syntax to link this PR: Fixes #<issue number>.

Summary

This refactors the console navigation ownership so MainNav only owns the global navigation bundle. Feature-owned detail sidebars now render from their respective detail layouts and share a neutral DetailSidebarFrame under app/components/detail-sidebar.

Changes include:

• Move detail sidebar frame and persisted expand/collapse storage out of main-nav.
• Hide the global main nav from MainNavLayout on detail routes that render their own sidebar.
• Move app, dataset, agent, deployment, and snippet detail sidebar rendering into their feature layouts.
• Move snippet detail sidebar components from main-nav into the snippets feature.
• Add boundary tests to prevent feature detail sidebar modules from being pulled into main-nav again.

No linked issue was provided for this local Codex task.

Validation:

• pnpm -C web test app/components/main-nav/__tests__/index.spec.tsx app/components/main-nav/__tests__/layout.spec.tsx app/components/detail-sidebar/__tests__/index.spec.tsx
• pnpm -C web test 'app/(commonLayout)/app/(appDetailLayout)/[appId]/__tests__/layout-main.spec.tsx' 'app/(commonLayout)/datasets/(datasetDetailLayout)/[datasetId]/__tests__/layout-main.spec.tsx' app/components/snippets/components/__tests__/snippet-layout.spec.tsx
• pnpm -C web test app/components/app/configuration/hooks/__tests__/use-configuration.spec.tsx
• pnpm -C web type-check
• pnpm -C web lint:tss
• git diff --check

Note: cd web && pnpm exec vp staged was attempted, but this checkout reports no staged config in vite.config.ts. The commit hook did run eslint --fix --pass-on-unpruned-suppressions successfully.

From Codex

Screenshots

Before	After
N/A	N/A

Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint && make type-check (backend) and cd web && pnpm exec vp staged (frontend) to appease the lint gods

[codecov]

Codecov Report

❌ Patch coverage is 90.22556% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.36%. Comparing base (93981cf) to head (2716a9b).

Files with missing lines	Patch %	Lines
web/app/components/detail-sidebar/index.tsx	83.07%	11 Missing ⚠️
web/app/components/main-nav/routes.ts	93.93%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             main   #38241     +/-   ##
=========================================
  Coverage   85.36%   85.36%             
=========================================
  Files        4979     4973      -6     
  Lines      262037   259605   -2432     
  Branches    49629    49388    -241     
=========================================
- Hits       223682   221613   -2069     
+ Misses      33971    33693    -278     
+ Partials     4384     4299     -85     

Flag	Coverage Δ
dify-ui	94.93% <ø> (ø)
web	85.07% <90.22%> (-0.01%)	⬇️

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