fix(tauri): replace silent let _ = with structured logging across 20 modules

Replace error-swallowing let _ = patterns with tracing::warn! in browser,
classroom, gateway, intelligence, memory, pipeline, secure_storage, and
viking command handlers. Ensures errors are observable in production logs.

desktop/src-tauri/src/intelligence/reflection.rs

@@ -719,6 +719,7 @@ pub type ReflectionEngineState = Arc<Mutex<ReflectionEngine>>;
 
 /// Initialize reflection engine with config
 /// Updates the shared state with new configuration
+// @connected
 #[tauri::command]
 pub async fn reflection_init(
     config: Option<ReflectionConfig>,
@@ -732,6 +733,7 @@ pub async fn reflection_init(
 }
 
 /// Record a conversation
+// @connected
 #[tauri::command]
 pub async fn reflection_record_conversation(
     state: tauri::State<'_, ReflectionEngineState>,
@@ -742,6 +744,7 @@ pub async fn reflection_record_conversation(
 }
 
 /// Check if reflection should run
+// @connected
 #[tauri::command]
 pub async fn reflection_should_reflect(
     state: tauri::State<'_, ReflectionEngineState>,
@@ -751,6 +754,7 @@ pub async fn reflection_should_reflect(
 }
 
 /// Execute reflection
+// @connected
 #[tauri::command]
 pub async fn reflection_reflect(
     agent_id: String,
@@ -766,6 +770,7 @@ pub async fn reflection_reflect(
 /// Returns in-memory history first. If empty and an agent_id is provided,
 /// falls back to the persisted history array from VikingStorage metadata,
 /// then to the single latest result for backward compatibility.
+// @connected
 #[tauri::command]
 pub async fn reflection_get_history(
     limit: Option<usize>,
@@ -815,6 +820,7 @@ pub async fn reflection_get_history(
 }
 
 /// Get reflection state
+// @connected
 #[tauri::command]
 pub async fn reflection_get_state(
     state: tauri::State<'_, ReflectionEngineState>,