Fix comprehensive lint and type errors across codebase

- Replace explicit 'any' types with 'unknown' or specific types
- Fix Jest DOM test setup with proper type definitions
- Resolve NODE_ENV assignment errors using Object.defineProperty
- Fix React Hook dependency warnings with useCallback patterns
- Remove unused variables and add appropriate ESLint disables
- Update documentation with groups feature information
- Ensure all tests pass with proper TypeScript compliance

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

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

CLAUDE.md

@@ -84,6 +84,8 @@ This is a Next.js web application that controls multiple OBS Source Switchers. I
 #### Team Management
 - `GET /api/teams` - Get all teams
 - `GET /api/getTeamName` - Get team name by ID
+- `POST /api/createGroup` - Create OBS group from team
+- `POST /api/syncGroups` - Synchronize all teams with OBS groups
 
 #### System Status
 - `GET /api/obsStatus` - Real-time OBS connection and streaming status
@@ -92,7 +94,7 @@ This is a Next.js web application that controls multiple OBS Source Switchers. I
 
 Dynamic table names with seasonal configuration:
 - `streams_YYYY_SEASON_SUFFIX`: id, name, obs_source_name, url, team_id
-- `teams_YYYY_SEASON_SUFFIX`: team_id, team_name
+- `teams_YYYY_SEASON_SUFFIX`: team_id, team_name, group_name
 
 ### OBS Integration Pattern
 
@@ -100,6 +102,7 @@ The app uses a sophisticated dual integration approach:
 
 1. **WebSocket Connection**: Direct OBS control using obs-websocket-js with persistent connection management
 2. **Text File System**: Each screen position has a corresponding text file that OBS Source Switcher monitors
+3. **Group Management**: Teams can be mapped to OBS groups (implemented as scenes) for organized source management
 
 **Required OBS Source Switchers** (must be created with these exact names):
 - `ss_large` - Large screen source switcher