feat(09-03): create database seeding fixture for E2E tests

- Add test fixture with seededDb for predictable test data
- Include 5 entries: tasks and thoughts with various states
- Include 3 tags with entry-tag relationships
- Export extended test with fixtures from tests/e2e/index.ts
- Install drizzle-seed dependency

package.json

@@ -32,6 +32,7 @@
 		"@vitest/browser-playwright": "^4.0.18",
 		"@vitest/coverage-v8": "^4.0.18",
 		"drizzle-kit": "^0.31.8",
+		"drizzle-seed": "^0.3.1",
 		"eslint": "^9.39.2",
 		"eslint-config-prettier": "^10.1.8",
 		"eslint-plugin-svelte": "^3.14.0",