Add Playwright e2e coverage + comment-level video upload workflow (#40)

## Summary
- add Playwright e2e auth setup + seeded test DB flow
- fix Playwright startup order so DB seed runs before web server uses SQLite
- add full trip-planning e2e scenario (future trip, travellers, destination, flight, lodging, upcoming verification)
- configure Auth.js custom sign-in page for base-path routing
- add repo guidance in AGENTS.md / CLAUDE.md requiring e2e for user-facing changes
- document and validate comment-level Gitea video attachment workflow (create comment, upload to comment assets endpoint)

## Validation
- bunx playwright test e2e/auth.test.ts --project=chromium\n- bunx playwright test e2e/trip-planning.test.ts --project=chromium
- PW_VIDEO_MODE=on PW_TRACE_MODE=off bunx playwright test e2e/trip-planning.test.ts --project=chromium

## Issue
- relates to #38

Co-authored-by: AI Agent <ai-agent@campbellwireless.net>
Reviewed-on: #40
Co-authored-by: Shaun Campbell <shaun@campbellwireless.net>
Co-committed-by: Shaun Campbell <shaun@campbellwireless.net>

CLAUDE.md

@@ -28,6 +28,18 @@ After making changes, always verify:
 1. `bun run lint` — must exit with 0 errors (warnings are acceptable)
 2. `bun run test` — all tests must pass
 
+For user-facing feature work, also add/update e2e coverage and validate it:
+3. `bunx playwright test <target spec or suite>`
+
+When work maps to a Gitea issue, upload an e2e run video to the issue:
+- Generate one-off video artifacts with:
+  - `PW_VIDEO_MODE=on PW_TRACE_MODE=on bunx playwright test <target spec>`
+- Prefer comment-level attachments: create a comment first, then attach video to that comment.
+  - `tea comment -l <login> -r <owner>/<repo> <issue-index> "<message>"`
+- Upload with `curl` (the current `tea api` build here does not send multipart/form-data correctly for attachments):
+  - `TOKEN=$(awk '/- name: cloud.campbellwireless.net/{f=1} f && $1=="token:"{print $2; exit}' "$HOME/Library/Application Support/tea/config.yml")`
+  - `curl -fsS -X POST "https://cloud.campbellwireless.net/git/api/v1/repos/{owner}/{repo}/issues/comments/{comment_id}/assets" -H "Authorization: token $TOKEN" -F "name=<filename>" -F "attachment=@<path>"`
+
 ### Write unit tests after every major feature
 
 When adding or significantly modifying server-side business logic (files under `src/lib/server/`), write corresponding unit tests in a `.test.ts` file alongside the module (e.g. `src/lib/server/lodgings.test.ts`).