[US-3.1 / OBT-203] Create a language inline from the project form

[levigtri]

Summary

US-3.1 / OBT-203 — Let users create a new language directly from the project creation/edit form, without navigating away to the Languages page and losing their progress.

Changes

1. ProjectsPage.tsx: add a "New language" link next to the language selector that opens a nested dialog (Radix supports nested dialogs) with name and code fields.
2. On save, handleCreateLanguage calls languagesAPI.create, invalidates and re-fetches the languages store, auto-selects the new language, and closes the nested dialog. The project form state (name, description) is preserved throughout.
3. Duplicate-code (409) and generic errors are surfaced via toast.

Type of Change

• Feature

Testing

• npm run typecheck — pass
• npm run lint — 0 errors (pre-existing ProjectsPage warning only)
• npm run build — pass

Front-only — uses the existing languages API.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: QUIET

Plan: Pro Plus

Run ID: 85f05b67-a082-4f73-8ad9-0f789b5a292b

📥 Commits

Reviewing files that changed from the base of the PR and between 130fc4a and 287747f.

📒 Files selected for processing (1)

• src/components/pages/ProjectsPage.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch levigft/obt-203-us-31-create-a-new-language-directly-from-the-project

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