fix(i18n): add missing dashboard keys and fix EN fallbacks

[Gi99lin]

Summary

• Fix Provider Quota showing Portuguese labels (Crítico, Alerta, Tipo, etc.) when English was selected: keys were missing from en.json and component fallbacks were PT-only.
• Add 26 missing usage, combos, settings, providers, cache, costs, and contextCaveman keys to en.json and sync to all 41 locales via i18n:sync-ui.
• Wire dashboard components to t() instead of hardcoded strings (Provider Limits, Provider card, Cache, Costs, Caveman).
• Add unit tests asserting critical i18n keys exist in en.json.

Test plan

• Open Provider Quota with locale EN — status cards show Total / Critical / Alert / Healthy; filters show Type / Tier.
• Open Settings → Codex Fast Tier — tier and model labels render in English (not raw keys).
• Edit Antigravity provider — Client profile select shows translated label and hint.
• Switch locale to pt-BR / ru on Provider Quota — verify localized labels where translated.
• Run node --import tsx --test tests/unit/provider-limits-ui.test.ts

[gemini-code-assist]

Code Review

This pull request externalizes hardcoded strings into translation keys across several dashboard components, including the cache, costs, providers, and usage pages. It also populates internationalization files with missing keys and adds unit tests to ensure these keys are defined in the English locale. Feedback highlights a few remaining hardcoded strings in the Caveman context page description and the 'Fast' tier label in provider cards that should be localized for consistency.

[gemini-code-assist]

The description text for the "Input compression" section is still hardcoded in English. Since this PR aims to wire dashboard components to translation keys, this paragraph should also be externalized to the i18n messages.

Suggested change

	<p className="mt-1 text-xs text-text-muted">
	Rewrite chat history with shorter wording. Reduces input tokens by ~50%.
	</p>
	<p className="mt-1 text-xs text-text-muted">
	{t("inputCompressionDesc")}
	</p>

[gemini-code-assist]

The visible label "Fast" inside the chip remains hardcoded. Since the title attribute was updated to use a translation key (codexFastTierActiveChip), the label itself should also be localized for consistency.

Suggested change

	Fast
	{t("tierFast")}

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Overview

Severity	Count
CRITICAL	0
WARNING	0
SUGGESTION	0

Files Reviewed (7 files)

• src/app/(dashboard)/dashboard/cache/page.tsx - aria-label wired to t() call
• src/app/(dashboard)/dashboard/context/caveman/CavemanContextPageClient.tsx - section title wired to t() call
• src/app/(dashboard)/dashboard/costs/CostOverviewTab.tsx - legacyFreeLabel prop threaded through components
• src/app/(dashboard)/dashboard/providers/components/ProviderCard.tsx - chip title wired to t() call
• src/app/(dashboard)/dashboard/usage/components/ProviderLimits/index.tsx - Portuguese fallbacks replaced with English in tr() calls; lite filter entry converted from hardcoded label to i18n labelKey
• src/i18n/messages/en.json - 26 new keys added with proper English translations (verified no __MISSING__: prefix)
• tests/unit/provider-limits-ui.test.ts - assertions for i18n key existence and non-placeholder values

All 41 non-English locale files receive the same keys with __MISSING__: prefix, which is expected behavior for the i18n sync process and will be resolved by human translators.

The component changes correctly use t() and tr() helpers. The tr() fallback strings are now consistently English instead of mixed Portuguese. The test assertions properly validate that en.json keys exist and are not placeholders.

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_{Reviewed by qwen3.6-plus · 727,505 tokens}

[kilo-code-bot]

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