Fix unused variables and clean up codebase

- Remove unused NextResponse imports from API routes
- Remove unused result variable in teams DELETE route
- Remove unused Link import from page.tsx
- Remove unused inspectTextSourceProperties function from obsClient.js
- Fix unused catch variables and response variables in test files
- Clean up all ESLint warnings for unused variables

app/api/teams/[teamId]/route.ts

@@ -126,7 +126,7 @@ export async function DELETE(
             );
             
             // Delete the team
-            const result = await db.run(
+            await db.run(
                 `DELETE FROM ${TABLE_NAMES.TEAMS} WHERE team_id = ?`,
                 [teamId]
             );