fix: contain settings shell scroll and stabilize validation suites

[saagpatel]

What

• Fix the Settings shell scroll and white-background leak in the desktop app
• Stabilize the validation suites that were failing for unrelated local-storage and test-setup reasons
• Clean up the local search API setup so its test lane runs reliably

Why

• Scrolling down on Settings could reveal a white surface in the installed app
• Several failing validation lanes were masking real regressions and slowing down release confidence
• The search API test setup had a dependency and Python-version mismatch that blocked local verification

How

• Contain scrolling inside the revamp shell and paint the shell and Settings surfaces directly
• Add a shared in-memory storage setup for Vitest and enable the admin flag explicitly in the admin UI test
• Refresh the updated visual baseline after the intended shell change
• Pin an installable flask-limiter version and document Python 3.11 for local search-api setup
• Remove broken pre-commit ESLint lint-staged entries because the repo does not currently ship an ESLint config for that hook path

Testing

• pnpm run check:monorepo-readiness
• pnpm exec playwright test
• pnpm test:ci
• pnpm search-api:test

Risks

• The shell visual snapshot changed intentionally because the surface/background treatment changed
• Local search-api setup now assumes Python 3.11 for the pinned scientific stack
• The lint-staged change keeps formatting on commit but no longer runs ESLint from the hook until a repo ESLint config is added

Performance impact

• No expected runtime performance regression
• The user-facing fix is CSS/layout only, and the remaining changes are test and tooling stabilization

Lockfile rationale

• No lockfile changes were needed

Screenshots

• UI verification was covered by the refreshed Playwright visual snapshot for the updated shell appearance

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restore vertical scroll for oversized right rail

Setting .as-shell__content to overflow: hidden traps the diagnostics rail when its content exceeds the viewport height (common on shorter desktop windows, since the rail renders multiple stacked panels). Because .as-shell__rail itself still has no scrolling behavior, users can no longer reach the lower actions/guidance items that were previously reachable via page scroll. Add a scroll container on the rail or avoid hiding overflow at this level.

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