Perfect! The fix is now implemented. Here's what the change does: (#618)

## What the fix accomplishes:

1. **Captures the current state** before updating the config
2. **Detects when analytics is newly enabled** - when it changes from `None` (first-time) or `false` (previously disabled) to `true`
3. **Immediately sends `session_start`** for that current session when analytics is enabled

## Now the flow works correctly:

**First-time user:**
- App starts (no session_start - analytics not enabled yet)
- User sees privacy dialog, clicks "Yes"
- Config updated with `analytics_enabled: true`
- **session_start event fires immediately** ✓
- All subsequent events in that session have proper session context

**Returning user (already opted in):**
- App starts → session_start fires from main.rs ✓
- Normal session tracking continues

**User re-enabling analytics:**
- User toggles analytics back on in Settings
- **session_start event fires immediately** ✓
- Session tracking resumes

This ensures every analytics session has a `session_start` event without sending any events before user consent!

crates/server/src/routes/config.rs

@@ -88,12 +88,25 @@ async fn update_config(
 ) -> ResponseJson<ApiResponse<Config>> {
     let config_path = config_path();
 
+    // Get the current analytics_enabled state before updating
+    let old_analytics_enabled = {
+        let config = deployment.config().read().await;
+        config.analytics_enabled
+    };
+
     match save_config_to_file(&new_config, &config_path).await {
         Ok(_) => {
             let mut config = deployment.config().write().await;
             *config = new_config.clone();
             drop(config);
 
+            // If analytics was just enabled (changed from None/false to true), track session_start
+            if new_config.analytics_enabled == Some(true) && old_analytics_enabled != Some(true) {
+                deployment
+                    .track_if_analytics_allowed("session_start", serde_json::json!({}))
+                    .await;
+            }
+
             ResponseJson(ApiResponse::success(new_config))
         }
         Err(e) => ResponseJson(ApiResponse::error(&format!("Failed to save config: {}", e))),