(CODUX-226) Complete remaining dashboard German coverage and repair i18n regressions

[numnx]

🧩 Task: Complete remaining dashboard German coverage and repair i18n regressions

Automated task PR opened by Code UX for T27.

📋 Summary

Sprint: Sprint 226 · Dashboard internationalization foundation · Task: T27

Establish a dashboard-only English/German internationalization system with persisted locale selection, complete German coverage across every dashboard route and overlay except English documentation bodies, locale-aware formatting, and automated coverage checks while preserving backend contracts and runtime/API-authored messages verbatim.

🤖 Model & Provider

Provider	Codex CLI
Model	gpt-5.6-sol

⏱️ Timing

Started	2026-07-14 20:38:42 UTC
Finished	2026-07-14 21:48:40 UTC
Duration	1h 9m 58s

📊 Token Usage

Metric	Value
Input tokens	819,850
Cached input tokens	41,792,768
Output tokens	148,738
Total tokens	42,761,356
Invocations	1
Tool calls	294
Active time	1h 9m 33s

Included usage estimate (subscription/local login): $29.46

✅ QA Review

⏳ QA review runs after this PR is opened. Check the task card in the dashboard for the outcome once it lands.

📝 Full Task Prompt

## Objective
Finish the sprint's complete German dashboard coverage and restore the full dashboard test suite.

## Scope
- Remove the 285 temporary `pre-existing English feature copy` exemptions from `scripts/dashboard-i18n-allowlist.json` wherever they are dashboard-owned UI.
- Translate the affected surfaces in Custom Dashboards, Nodes, Settings integrations/chat connectors, Stats cost panels, Tasks, and workflow status presentation using the owning feature catalogs.
- Preserve technical identifiers, protocol values, provider/runtime/API-authored messages, logs, paths, user-authored content, and documentation content verbatim.
- Repair the confirmed failures in `tests/dashboard/accessibility/dashboard-quality-regressions.test.tsx`, `tests/dashboard/v2/settings-chat-providers-panel.test.tsx`, `tests/dashboard/v2/ai-model-catalog-panel.test.tsx`, `tests/dashboard/v2/overview-telemetry.test.tsx`, `tests/dashboard/v2/tasks-list.test.tsx`, `tests/dashboard/v2/knowledge-page-i18n.test.tsx`, and `tests/dashboard/v2/components/sprints/SprintProjectManagementImportModal.test.tsx`. Tests that explicitly render German must assert German accessible names; English-rendered tests must retain English expectations. Preserve existing accessibility, keyboard, runtime-data, and API-boundary assertions.

## Requirements
1. Keep the allowlist limited to exact technical, protocol, documentation, or verbatim-data exceptions with reviewable rationales; do not use it to defer dashboard-owned UI localization.
2. Add or reuse typed English/German catalog keys with parity and locale-aware formatting where required.
3. Ensure locale changes do not alter backend contracts, persisted values, provider output, runtime messages, or user-authored content.
4. Keep accessibility roles, names, focus restoration, live regions, responsive behavior, and keyboard interactions correct in both locales.

## Verification
- `pnpm run check:dashboard-i18n`
- `pnpm run quality:guardrails`
- Focused affected Vitest suites listed above
- `pnpm run test:dashboard`
- `pnpm run lint`
- `pnpm run build`

🌿 Branch Info

Base: feature/CODUX-226-dashboard-internationalization-foundation
Head: task/feature-codux-22-t27-codex-117cb86f-mrl46221

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🤖 Generated by Code UX