chore(ui-v2): regenerate routeTree.gen.ts and fail CI on dirty worktree

[devin-ai-integration]

Regenerates ui-v2/src/routeTree.gen.ts from the current route tree and adds a post-build dirty-worktree check to the UI v2 Checks workflow so PRs fail if generated files are out of sync.

Changes

• ui-v2/src/routeTree.gen.ts: regenerated via vite build.
• .github/workflows/ui-v2-checks.yml: after npm run build, fail the build if git status --porcelain reports any changes under ui-v2/.

Validation

• npx vite build in ui-v2/ completes successfully.
• npx biome ci . passes (3 warnings, 1 info).
• npm run lint passes (7 warnings, 0 errors).
• npm run validate:types passes.
• Running build leaves the worktree clean (git status --short is empty).

Checklist

• No linked issue — this is a small maintenance fix.
• If this is a complex change, a maintainer has confirmed the proposed approach on the linked issue. (small change)
• This pull request adds or changes functionality, it includes tests or explains why tests are not needed. (CI check is self-validating)
• This pull request changes user-facing behavior, it updates documentation or explains why documentation is not needed. (no user-facing behavior change)
• This pull request removes docs files, it includes redirect settings in mint.json. (no docs removed)
• This pull request adds functions or classes, it includes helpful docstrings. (no new functions/classes)

Link to Devin session: https://app.devin.ai/sessions/2a2749c72e064cc8a850e37ee39305fb
Requested by: @desertaxle

[devin-ai-integration]

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