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>

bun.lock

@@ -11,12 +11,14 @@
       "devDependencies": {
         "@biomejs/biome": "^2.4.4",
         "@eslint/js": "^10.0.1",
+        "@playwright/test": "^1.58.2",
         "@sveltejs/adapter-node": "^5.5.3",
         "@sveltejs/kit": "^2.50.2",
         "@sveltejs/vite-plugin-svelte": "^6.2.4",
         "@tailwindcss/vite": "^4.2.0",
         "@vitest/coverage-v8": "^4.0.18",
         "bun-types": "^1.3.9",
+        "dotenv": "^17.3.1",
         "eslint": "^10.0.0",
         "eslint-plugin-svelte": "^3.15.0",
         "globals": "^17.3.0",
@@ -156,6 +158,8 @@
 
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+    "@playwright/test": ["@playwright/test@1.58.2", "", { "dependencies": { "playwright": "1.58.2" }, "bin": { "playwright": "cli.js" } }, "sha512-akea+6bHYBBfA9uQqSYmlJXn61cTa+jbO87xVLCWbTqbWadRVmhxlXATaOjOgcBaWU4ePo0wB41KMFv3o35IXA=="],
+
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     "@rollup/plugin-commonjs": ["@rollup/plugin-commonjs@29.0.0", "", { "dependencies": { "@rollup/pluginutils": "^5.0.1", "commondir": "^1.0.1", "estree-walker": "^2.0.2", "fdir": "^6.2.0", "is-reference": "1.2.1", "magic-string": "^0.30.3", "picomatch": "^4.0.2" }, "peerDependencies": { "rollup": "^2.68.0||^3.0.0||^4.0.0" }, "optionalPeers": ["rollup"] }, "sha512-U2YHaxR2cU/yAiwKJtJRhnyLk7cifnQw0zUpISsocBDoHDJn+HTV74ABqnwr5bEgWUwFZC9oFL6wLe21lHu5eQ=="],
@@ -358,6 +362,8 @@
 
     "devalue": ["devalue@5.6.2", "", {}, "sha512-nPRkjWzzDQlsejL1WVifk5rvcFi/y1onBRxjaFMjZeR9mFpqu2gmAZ9xUB9/IEanEP/vBtGeGganC/GO1fmufg=="],
 
+    "dotenv": ["dotenv@17.3.1", "", {}, "sha512-IO8C/dzEb6O3F9/twg6ZLXz164a2fhTnEWb95H23Dm4OuN+92NmEAlTrupP9VW6Jm3sO26tQlqyvyi4CsnY9GA=="],
+
     "enhanced-resolve": ["enhanced-resolve@5.19.0", "", { "dependencies": { "graceful-fs": "^4.2.4", "tapable": "^2.3.0" } }, "sha512-phv3E1Xl4tQOShqSte26C7Fl84EwUdZsyOuSSk9qtAGyyQs2s3jJzComh+Abf4g187lUUAvH+H26omrqia2aGg=="],
 
     "es-module-lexer": ["es-module-lexer@1.7.0", "", {}, "sha512-jEQoCwk8hyb2AZziIOLhDqpm5+2ww5uIE6lkO/6jcOCusfk6LhMHpXXfBLXTZ7Ydyt0j4VoUQv6uGNYbdW+kBA=="],
@@ -540,6 +546,10 @@
 
     "picomatch": ["picomatch@4.0.3", "", {}, "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q=="],
 
+    "playwright": ["playwright@1.58.2", "", { "dependencies": { "playwright-core": "1.58.2" }, "optionalDependencies": { "fsevents": "2.3.2" }, "bin": { "playwright": "cli.js" } }, "sha512-vA30H8Nvkq/cPBnNw4Q8TWz1EJyqgpuinBcHET0YVJVFldr8JDNiU9LaWAE1KqSkRYazuaBhTpB5ZzShOezQ6A=="],
+
+    "playwright-core": ["playwright-core@1.58.2", "", { "bin": { "playwright-core": "cli.js" } }, "sha512-yZkEtftgwS8CsfYo7nm0KE8jsvm6i/PTgVtB8DL726wNf6H2IMsDuxCpJj59KDaxCtSnrWan2AeDqM7JBaultg=="],
+
     "postcss": ["postcss@8.5.6", "", { "dependencies": { "nanoid": "^3.3.11", "picocolors": "^1.1.1", "source-map-js": "^1.2.1" } }, "sha512-3Ybi1tAuwAP9s0r1UQ2J4n5Y0G05bJkpUIO0/bI9MhwmD70S5aTWbXGBwxHrelT+XM1k6dM0pk+SwNkpTRN7Pg=="],
 
     "postcss-load-config": ["postcss-load-config@3.1.4", "", { "dependencies": { "lilconfig": "^2.0.5", "yaml": "^1.10.2" }, "peerDependencies": { "postcss": ">=8.0.9", "ts-node": ">=9.0.0" }, "optionalPeers": ["postcss", "ts-node"] }, "sha512-6DiM4E7v4coTE4uzA8U//WhtPwyhiim3eyjEMFCnUpzbrkK9wJHgKDT2mR+HbtSrd/NubVaYTOpSpjUl8NQeRg=="],
@@ -674,6 +684,8 @@
 
     "eslint-plugin-svelte/globals": ["globals@16.5.0", "", {}, "sha512-c/c15i26VrJ4IRt5Z89DnIzCGDn9EcebibhAOjw5ibqEHsE1wLUgkPn9RDmNcUKyU87GeaL633nyJ+pplFR2ZQ=="],
 
+    "playwright/fsevents": ["fsevents@2.3.2", "", { "os": "darwin" }, "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA=="],
+
     "svelte-eslint-parser/eslint-scope": ["eslint-scope@8.4.0", "", { "dependencies": { "esrecurse": "^4.3.0", "estraverse": "^5.2.0" } }, "sha512-sNXOfKCn74rt8RICKMvJS7XKV/Xk9kA7DyJr8mJik3S7Cwgy3qlkkmyS2uQB3jiJg6VNdZd/pDBJu0nvG2NlTg=="],
 
     "svelte-eslint-parser/eslint-visitor-keys": ["eslint-visitor-keys@4.2.1", "", {}, "sha512-Uhdk5sfqcee/9H/rCOJikYz67o0a2Tw2hGRPOG2Y1R2dg7brRe1uG0yaNQDHu+TO/uQPF/5eCapvYSmHUjt7JQ=="],