test(frontend): migrate Studio catalog tests by risk

[AbigailDeng]

Summary

• record review outcomes for all 38 frontend test files above 300 lines and classify the five priority suites by behavior, risk, and highest-value test layer
• replace a mock-call-only Studio bootstrap case with route integration evidence that discovered GAgent kinds reach the real Build panel and published workflow/service/revision identity reaches the Team member rail
• add a focused real-component interaction proving the operator-selected GAgent kind is retained in the Build-to-Bind handoff
• consolidate workflow, Script, and GAgent service-revision fixtures for later behavior-domain extraction without duplicating the oversized route setup
• document residual browser, SSE, OAuth, responsive-layout, and projection-timing gaps without changing production behavior

Impact

• apps/aevatar-console-web/docs/2026-07-31-frontend-test-suite-risk-audit.md
• apps/aevatar-console-web/src/pages/studio/index.test.tsx
• apps/aevatar-console-web/src/pages/studio/components/StudioBuildPanels.test.tsx
• apps/aevatar-console-web/tests/studioServiceCatalogFixtures.ts
• no production behavior or runtime bundle changes

Verification

• pnpm --dir apps/aevatar-console-web exec jest --runInBand --runTestsByPath src/pages/studio/index.test.tsx src/pages/studio/components/StudioBuildPanels.test.tsx --testNamePattern 'shows the standalone GAgent definition fields inside Build|renders published revision identity for each service in the initial Studio rail|hands the operator-selected GAgent kind from Build to Bind': passed (3 focused cases in 2 files)
• pnpm --dir apps/aevatar-console-web tsc: passed
• pnpm --dir apps/aevatar-console-web exec biome lint src/pages/studio/index.test.tsx src/pages/studio/components/StudioBuildPanels.test.tsx tests/studioServiceCatalogFixtures.ts: passed with 3 pre-existing warnings and no errors
• bash tools/ci/test_stability_guards.sh: passed
• bash tools/docs/lint.sh: passed (83 files, 0 errors)
• frontend audit inventory guard: passed (38 oversized files recorded, 0 missing)
• git diff --check: passed
• the complete frontend suite, integration tests, browser end-to-end tests, and smoke tests were not run under the incremental test policy

Risks

• OAuth redirects, native browser history and leave prompts, pointer/responsive layout, real SSE and multipart transport, deployed routing, and production projection timing remain explicitly recorded browser or integration gaps

Closes #3100

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.34%. Comparing base (2fbf3c4) to head (ba93eeb).
⚠️ Report is 5 commits behind head on dev.

@@            Coverage Diff             @@
##              dev    #3104      +/-   ##
==========================================
- Coverage   84.34%   84.34%   -0.01%     
==========================================
  Files        1455     1455              
  Lines      127991   127991              
  Branches    15956    15956              
==========================================
- Hits       107954   107948       -6     
- Misses      12740    12745       +5     
- Partials     7297     7298       +1     

Flag	Coverage Δ
ci	84.34% <ø> (-0.01%)	⬇️

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see 2 files with indirect coverage changes

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