refactor: simplify readLog to use standard Supervisor XML-RPC API

Removed SUPERVISOR_LOGFILE environment variable and simplified readLog()
to use the standard 2-parameter XML-RPC API that relies on supervisord's
configured logfile path.

Changes:
- Removed SUPERVISOR_LOGFILE from .env.example
- Simplified SupervisorClient.readLog() to accept only offset and length
- Removed logfile path parameter and all environment variable logic
- Fixed mobile nav container padding (removed px-4 py-6)

The readLog() method now uses the standard supervisor.readLog(offset, length)
XML-RPC call, which automatically reads from the logfile path configured
in supervisord.conf.

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

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

lib/supervisor/client.ts

@@ -252,11 +252,8 @@ export class SupervisorClient {
     return this.call<ProcessActionResult[]>('supervisor.clearAllProcessLogs');
   }
 
-  async readLog(offset: number, length: number, logfilePath?: string): Promise<string> {
-    // Use provided path, or fall back to env variable, or use default
-    const path = logfilePath || process.env.SUPERVISOR_LOGFILE || '/var/log/supervisor/supervisord.log';
-    this.logger.debug({ path, offset, length }, 'Reading supervisor main log');
-    return this.call<string>('supervisor.readLog', [offset, length, path]);
+  async readLog(offset: number, length: number): Promise<string> {
+    return this.call<string>('supervisor.readLog', [offset, length]);
   }
 
   async clearLog(): Promise<boolean> {