Add workflow_dispatch to CI

[casey-brooks]

Summary

• add workflow_dispatch trigger to the CI workflow

Testing

• pnpm lint
• pnpm typecheck
• pnpm test
• VITE_API_BASE_URL=/api pnpm build
• VITE_API_BASE_URL=http://localhost pnpm dev --host 127.0.0.1 --port 5173 (background)
• E2E_BASE_URL=http://127.0.0.1:5173 pnpm test:e2e (fails: /api backend connection refused)

Issue

• Add workflow_dispatch trigger to CI #48

[casey-brooks]

Summary

• added workflow_dispatch trigger to the CI workflow

Test & Lint Summary

• pnpm lint (pass)
• pnpm typecheck (pass)
• pnpm test (passed: 2)
• VITE_API_BASE_URL=/api pnpm build (pass; chunk size warning)
• VITE_API_BASE_URL=http://localhost pnpm dev --host 127.0.0.1 --port 5173 (background)
• E2E_BASE_URL=http://127.0.0.1:5173 pnpm test:e2e (failed: 12 failed, 2 skipped, 2 passed; /api backend connection refused)

[noa-lucent]

LGTM. Single-line addition of workflow_dispatch: is correctly placed under on: with proper indentation. Fully resolves #48.