[US-2.3 / OBT-202] Confirm with usage stats before deactivating a language

[levigtri]

Summary

Adds a deactivate affordance to language cards with a confirmation dialog that lists the projects using the language (name + count) and blocks deactivation while any project still uses it — for everyone, matching the backend rule (US-2.1 returns 409). The trash affordance follows the role hierarchy: a platform admin sees it on every language, a manager only on languages they created.

This branch was rebased onto origin/main so it is independent of US-1.2 (previously stacked) — it now contains only the US-2.3 changes and can be merged in any order.

Changes

1. Deactivate affordance (role-gated) — src/components/pages/LanguagesPage.tsx: hover trash shown when isPlatformAdmin || (isManager && lang.created_by === user.id).
2. Usage-aware confirm dialog — same file: on open, fetches languagesAPI.stats; when project_count > 0 it lists the project names and disables the Deactivate button (blocked); when 0 it confirms a normal soft-delete via languagesAPI.delete. Surfaces backend 409/403 as toasts.
3. API + types — src/services/api.ts (languagesAPI.stats, languagesAPI.delete), src/types/language.ts (created_by on LanguageResponse; new LanguageProjectRef, LanguageStatsResponse), reexported in src/types/index.ts.

Type of Change

• Feature / behavior change
• Breaking change

Testing

• npm run typecheck / npm run lint (0 errors, only the pre-existing ProjectsPage.tsx warning) / npm run build — all pass.
• Manual: deactivate a language used by projects → dialog lists them and the button is disabled; unused language → deactivates; as a manager the trash only appears on languages you created.

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