fix: persist channel activation state across restarts (#432)

* fix: persist channel activation state across restarts (#392)

Channels activated via the web UI were lost on restart because
active_channel_names was only in memory. Now persist activation state
to the settings store under "activated_channels" and auto-activate
persisted channels on startup.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* fix: log warnings for channel activation load failures

Replace silent catch-all with explicit error logging when
database queries or deserialization fails for activated channels.

Addresses Gemini review feedback on PR #432.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* Apply suggestions from code review

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

---------

Co-authored-by: Claude Opus 4.6 <[email protected]>
Co-authored-by: Illia Polosukhin <[email protected]>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

src/extensions/manager.rs

@@ -168,6 +168,53 @@ impl ExtensionManager {
         active.extend(names);
     }
 
+    /// Persist the set of active channel names to the settings store.
+    ///
+    /// Saved under key `activated_channels` so channels auto-activate on restart.
+    async fn persist_active_channels(&self) {
+        let Some(ref store) = self.store else {
+            return;
+        };
+        let names: Vec<String> = self
+            .active_channel_names
+            .read()
+            .await
+            .iter()
+            .cloned()
+            .collect();
+        let value = serde_json::json!(names);
+        if let Err(e) = store
+            .set_setting(&self.user_id, "activated_channels", &value)
+            .await
+        {
+            tracing::warn!(error = %e, "Failed to persist activated_channels setting");
+        }
+    }
+
+    /// Load previously activated channel names from the settings store.
+    ///
+    /// Returns channel names that were activated in a prior session so they can
+    /// be auto-activated at startup.
+    pub async fn load_persisted_active_channels(&self) -> Vec<String> {
+        let Some(ref store) = self.store else {
+            return Vec::new();
+        };
+        match store.get_setting(&self.user_id, "activated_channels").await {
+            Ok(Some(value)) => match serde_json::from_value(value) {
+                Ok(names) => names,
+                Err(e) => {
+                    tracing::warn!(error = %e, "Failed to deserialize activated_channels");
+                    Vec::new()
+                }
+            },
+            Ok(None) => Vec::new(),
+            Err(e) => {
+                tracing::warn!(error = %e, "Failed to load activated_channels setting");
+                Vec::new()
+            }
+        }
+    }
+
     /// Set the SSE broadcast sender for pushing extension status events to the web UI.
     pub async fn set_sse_sender(
         &self,
@@ -530,6 +577,10 @@ impl ExtensionManager {
                 Ok(format!("Removed WASM tool '{}'", name))
             }
             ExtensionKind::WasmChannel => {
+                // Remove from active set and persist
+                self.active_channel_names.write().await.remove(name);
+                self.persist_active_channels().await;
+
                 // Delete channel files
                 let wasm_path = self.wasm_channels_dir.join(format!("{}.wasm", name));
                 let cap_path = self
@@ -1993,6 +2044,9 @@ impl ExtensionManager {
             .await
             .insert(channel_name.clone());
 
+        // Persist activation state so the channel auto-activates on restart
+        self.persist_active_channels().await;
+
         tracing::info!(channel = %channel_name, "Hot-activated WASM channel");
 
         Ok(ActivateResult {