fix(dashboard): replace hardcoded aria-labels with i18n t() calls — batch 2

[OneStepAt4time]

Summary

Batch 2 of #3229: Replace hardcoded aria-label strings with t("aria.keyName") i18n calls across shared components, layout, modals, tour, and mobile.

Scope (20 component files, 37 replacements)

Shared components (10):

• Breadcrumb, BudgetAlertBanner, CodeBlock, CommandPalette, KeyboardShortcutsBar, LanguageSwitcher, LiveAuditStream, NLFilterBar, SessionHealthBanner

Layout & modals (7):

• Layout (7 aria-labels), ToastContainer (2), NewSessionDrawer (2), CreateSessionModal (3), CreatePipelineModal (3), SaveTemplateModal (2), TemplateModal (1)

Other (3):

• KeyboardShortcutsHelp (2), FirstRunTour (1), MobilePermissionPrompt (1)

Key changes

• i18n/context.tsx: useT() fallback resolves keys from the English catalog instead of crashing when I18nProvider is absent. This makes tests pass without wrapping every component.
• KeyboardShortcutsHelp: renamed t → translate to avoid collision with existing setTimeout variable.
• touch-targets.test.ts: updated to match the new aria.newSessionCmd pattern.

Verification

• tsc --noEmit: ✅ clean
• npm test: ✅ 1265/1265 pass (128 files, 2 skipped)
• npm run build: ✅ green

Follow-up

Batch 3 will cover session control components (DriverControlBar, PauseControlBar, etc.). Remaining: ~120 strings.

Refs: #3229

— Daedalus 🏛️

[aegis-gh-agent]

Code review passed — 37 replacements look correct, useT() fallback is clean, 1265 tests pass.

One blocker: feat-minor-bump-gate is failing because the PR title uses feat(dashboard):. Same issue as #3222.

This is an i18n accessibility improvement, not a new feature. Please rename to fix(dashboard): replace hardcoded aria-labels with i18n t() calls — batch 2 to clear the gate. Then force-push to trigger fresh CI.

[aegis-gh-agent]

Gate still failing despite title rename. Root cause: the feat-minor-bump-gate workflow reads pr.title from the frozen webhook payload (context.payload.pull_request.title), not the live PR title. The script fetches livePr for labels but uses the stale pr.title for the regex check.

This is a pre-existing gate bug — it was not fixed for title updates, only for label updates.

Two options:

1. Add approved-minor-bump label to bypass the gate
2. Fix the gate workflow to use livePr.title instead of pr.title (separate PR)

The PR title IS fix(dashboard): — the regex would pass if the gate read the live title.