refactor(web): migrate agent v2 app context consumers

[hyoban]

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Summary

• Related to [Refactor/Chore] Clarify and decouple web AppContext bootstrap dependencies #38514.
• Migrates Agent V2 AppContext consumers to direct bootstrap atom reads.
• Replaces broad context reads with currentWorkspaceIdAtom and userProfileAtom in the Agent V2 prompt icon resolver, preview chat runtime, and versions panel.
• Updates the affected Agent V2 tests to mock the exact app-context-state atoms used by production code.

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

Validation

• pnpm -C web exec eslint features/agent-v2/agent-detail/configure/components/__tests__/agent-prompt-editor.spec.tsx features/agent-v2/agent-detail/configure/components/orchestrate/prompt-editor/hooks.ts features/agent-v2/agent-detail/configure/components/preview/__tests__/chat.spec.tsx features/agent-v2/agent-detail/configure/components/preview/__tests__/versions-panel.spec.tsx features/agent-v2/agent-detail/configure/components/preview/chat-runtime.tsx features/agent-v2/agent-detail/configure/components/preview/versions-panel/index.tsx --cache --quiet
• pnpm -C web test features/agent-v2/agent-detail/configure/components/__tests__/agent-prompt-editor.spec.tsx features/agent-v2/agent-detail/configure/components/preview/__tests__/chat.spec.tsx features/agent-v2/agent-detail/configure/components/preview/__tests__/versions-panel.spec.tsx
• pnpm -C web type-check

Note: pnpm -C web exec vp staged currently exits before checking files because this checkout's vite.config.ts has no staged config. I did not change CI or Vite config for this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.34%. Comparing base (eca2d41) to head (cab74d9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #38558   +/-   ##
=======================================
  Coverage   85.34%   85.34%           
=======================================
  Files        5013     5013           
  Lines      265942   265942           
  Branches    50558    50558           
=======================================
  Hits       226980   226980           
  Misses      34509    34509           
  Partials     4453     4453           

Flag	Coverage Δ
dify-ui	94.61% <ø> (ø)
web	84.91% <100.00%> (ø)

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