Fix ESLint errors and warnings in main codebase

- Fix TypeScript error: Replace 'any' type with specific union type in teams API
- Remove unused variable assignment in obsClient.js
- Remove unused error binding in apiHelpers.ts catch block
- Disable exhaustive-deps rule for custom hook with dynamic dependencies

All blocking linter errors resolved. Remaining warnings are in test files only.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

lib/apiHelpers.ts

@@ -140,7 +140,7 @@ export async function parseRequestBody<T>(
     }
     
     return { success: true, data: body as T };
-  } catch (_error) {
+  } catch {
     return {
       success: false,
       response: createErrorResponse(