* feat(ui): cut budgets, workflows, and guardrails-monitor over to path routes
Continues the page-by-page App Router migration (#30185, #30226). All
three legacy switch arms passed only accessToken, so each route wrapper
is a thin useAuthorized() + render. MIGRATED_PAGES routes the sidebar
and redirects the legacy ?page= URLs; the e2e fixture picks all three
up in the migration smoke and sidebar specs automatically.
* refactor(ui): colocate budgets, workflows, and guardrails-monitor components
budgets and workflow_runs were imported only by the legacy switch, so
they move wholesale into their route folders; the budgetItem type
hoists into the shared useBudgets hook, which owns the API response
shape, so the hooks layer no longer imports from a page folder.
GuardrailsMonitor keeps LogViewer, mockData, and MetricCard at the
shared src/components home because ToolDetail and ToolPolicies import
them; the rest moves. eslint suppressions are re-keyed accordingly.
* fix(ui): restore MetricCard test-utils path and merge duplicate import
MetricCard.test.tsx got the moved-tree depth rewrite before being moved
back to src/components/GuardrailsMonitor, leaving a five-level path
that escapes the project root; the suite failed at import. Also merge
the two imports from useBudgets in budget_panel.tsx. Both flagged by
Greptile.
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