feat(logging): add comprehensive client-side logging (Phase 5)

Created client-side logging infrastructure for React Query and hooks:

New Client Logger (lib/utils/client-logger.ts):
- Environment-aware logging (debug/info in dev, warn/error in prod)
- Structured logging with context objects
- Performance timing helpers (time/timeEnd)
- Group logging for related operations
- Factory functions for hook/query/mutation-specific loggers

React Query Configuration (components/providers/Providers.tsx):
- Added custom logger to QueryClient
- Integrated with client-side logger for consistent formatting
- Configured mutation retry defaults

SSE Hook Logging (lib/hooks/useEventSource.ts):
- Connection lifecycle logging (connect/disconnect/reconnect)
- Heartbeat and process update event logging
- Error tracking with reconnection attempt details
- Exponential backoff logging for reconnections

Supervisor Hooks Logging (lib/hooks/useSupervisor.ts):
- Added logging to all critical mutation hooks:
  - Process control (start/stop/restart)
  - Batch operations (start-all/stop-all/restart-all)
  - Configuration reload
  - Signal operations
- Logs mutation start, success, and error states
- Includes contextual metadata (process names, signals, etc.)

All client-side logs:
- Use structured format with timestamps
- Include relevant context for debugging
- Respect environment (verbose in dev, minimal in prod)
- Compatible with browser devtools

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

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

components/providers/Providers.tsx

@@ -4,6 +4,7 @@ import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
 import { useState, ReactNode } from 'react';
 import { Toaster } from 'sonner';
 import { ThemeProvider } from './ThemeProvider';
+import { clientLogger } from '@/lib/utils/client-logger';
 
 export function Providers({ children }: { children: ReactNode }) {
   const [queryClient] = useState(
@@ -15,6 +16,14 @@ export function Providers({ children }: { children: ReactNode }) {
             refetchOnWindowFocus: false,
             retry: 2,
           },
+          mutations: {
+            retry: 1,
+          },
+        },
+        logger: {
+          log: (message) => clientLogger.debug(message),
+          warn: (message) => clientLogger.warn(message),
+          error: (error) => clientLogger.error('React Query error', error),
         },
       })
   );