Fix: return and display community submission confirmation ID (closes #66)

[dougbot-agent]

Summary

• return the generated submission ID from POST /api/communities/submit
• display that confirmation ID in the add-community success state for follow-up
• add regression coverage for both the route response and the client success UI

Root Cause

The submission flow already generated a unique submission-* ID server-side, but the API dropped it from the success response and the client had no way to surface it. Users could see a success message without retaining any durable reference for later follow-up.

Solution

• include submissionId in the successful route response
• extend the add-community form success state to render the returned confirmation ID
• keep failure behavior unchanged while tightening the client catch typing and using semantic success tokens in the UI

Test Plan

• Wrote failing tests first for the route response and form success UI
• Verified the new tests failed for the expected missing-confirmation-ID behavior
• Implemented the minimal fix to return and render the confirmation ID
• Re-ran targeted regression tests and they passed
• Ran the full unit test project and it passed
• Ran npx tsc --noEmit
• Ran targeted lint checks on touched files

Validation

• npx vitest run src/app/api/communities/submit/route.test.ts src/components/communities/AddCommunityForm.test.tsx --project unit --silent
• npx vitest run --project unit --silent
• npx tsc --noEmit
• npm run lint -- --max-warnings=0 src/app/api/communities/submit/route.ts src/components/communities/AddCommunityForm.tsx src/app/api/communities/submit/route.test.ts src/components/communities/AddCommunityForm.test.tsx

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Project	Deployment	Actions	Updated (UTC)
react-foundation	Ready	Preview, Comment	May 15, 2026 7:00pm

[dougbot-agent]

@sethwebster All CI checks are green on this automation-authored PR, but branch policy still requires a separate approval before merge. This is scoped just to returning + displaying the community submission confirmation ID for #66, with regression tests in place.