debug: Add detailed sidecar startup logging

Add more console.log statements to help debug sidecar startup issues:
- Log when startSidecar() is called
- Log sidecar directory and packaged status
- Log executable path check results

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

client/src/main.js

@@ -288,9 +288,12 @@ function createWindow() {
 }
 
 function startSidecar() {
+  console.log("=== startSidecar() called ===");
   const sidecarDir = app.isPackaged
     ? path.join(process.resourcesPath, "sidecar")
     : path.join(__dirname, "..", "..", "sidecar");
+  console.log("Sidecar directory:", sidecarDir);
+  console.log("App is packaged:", app.isPackaged);
 
   // Determine the sidecar executable path based on packaging and platform
   let sidecarExecutable;
@@ -327,11 +330,13 @@ function startSidecar() {
     sidecarArgs = [sidecarScript];
   }
 
+  console.log("Checking sidecar executable at:", sidecarExecutable);
   if (!fs.existsSync(sidecarExecutable)) {
-    console.log("Sidecar executable not found at:", sidecarExecutable);
+    console.log("ERROR: Sidecar executable not found at:", sidecarExecutable);
     console.log("Transcription will not be available.");
     return;
   }
+  console.log("Sidecar executable found:", sidecarExecutable);
 
   try {
     // Get Whisper configuration from config.json or environment variables