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/pipeline_commands/crud.rs

@@ -47,6 +47,7 @@ pub struct WorkflowStepInput {
 }
 
 /// Create a new pipeline as a YAML file
+// @connected
 #[tauri::command]
 pub async fn pipeline_create(
     state: State<'_, Arc<PipelineState>>,
@@ -132,6 +133,7 @@ pub async fn pipeline_create(
 }
 
 /// Update an existing pipeline
+// @connected
 #[tauri::command]
 pub async fn pipeline_update(
     state: State<'_, Arc<PipelineState>>,
@@ -201,6 +203,7 @@ pub async fn pipeline_update(
 }
 
 /// Delete a pipeline
+// @connected
 #[tauri::command]
 pub async fn pipeline_delete(
     state: State<'_, Arc<PipelineState>>,

desktop/src-tauri/src/pipeline_commands/discovery.rs

@@ -20,6 +20,7 @@ use super::helpers::{get_pipelines_directory, scan_pipelines_with_paths, scan_pi
 use crate::kernel_commands::KernelState;
 
 /// Discover and list all available pipelines
+// @connected
 #[tauri::command]
 pub async fn pipeline_list(
     state: State<'_, Arc<PipelineState>>,
@@ -67,6 +68,7 @@ pub async fn pipeline_list(
 }
 
 /// Get pipeline details
+// @connected
 #[tauri::command]
 pub async fn pipeline_get(
     state: State<'_, Arc<PipelineState>>,
@@ -81,6 +83,7 @@ pub async fn pipeline_get(
 }
 
 /// Run a pipeline
+// @connected
 #[tauri::command]
 pub async fn pipeline_run(
     app: AppHandle,
@@ -192,6 +195,7 @@ pub async fn pipeline_run(
 }
 
 /// Get pipeline run progress
+// @connected
 #[tauri::command]
 pub async fn pipeline_progress(
     state: State<'_, Arc<PipelineState>>,
@@ -217,6 +221,7 @@ pub async fn pipeline_progress(
 }
 
 /// Cancel a pipeline run
+// @connected
 #[tauri::command]
 pub async fn pipeline_cancel(
     state: State<'_, Arc<PipelineState>>,
@@ -227,6 +232,7 @@ pub async fn pipeline_cancel(
 }
 
 /// Get pipeline run result
+// @connected
 #[tauri::command]
 pub async fn pipeline_result(
     state: State<'_, Arc<PipelineState>>,
@@ -253,6 +259,7 @@ pub async fn pipeline_result(
 }
 
 /// List all runs
+// @connected
 #[tauri::command]
 pub async fn pipeline_runs(
     state: State<'_, Arc<PipelineState>>,
@@ -278,6 +285,7 @@ pub async fn pipeline_runs(
 }
 
 /// Refresh pipeline discovery
+// @connected
 #[tauri::command]
 pub async fn pipeline_refresh(
     state: State<'_, Arc<PipelineState>>,

desktop/src-tauri/src/pipeline_commands/intent_router.rs

@@ -62,6 +62,7 @@ pub struct PipelineCandidateInfo {
 }
 
 /// Route user input to matching pipeline
+// @connected
 #[tauri::command]
 pub async fn route_intent(
     state: State<'_, Arc<PipelineState>>,

desktop/src-tauri/src/pipeline_commands/presentation.rs

@@ -9,6 +9,7 @@ use super::types::PipelineInputInfo;
 use super::PipelineState;
 
 /// Analyze presentation data
+// @connected
 #[tauri::command]
 pub async fn analyze_presentation(
     data: Value,
@@ -43,6 +44,7 @@ pub struct PipelineTemplateInfo {
 /// Templates are pipeline YAML files that users can browse and instantiate.
 /// They live in `pipelines/_templates/` and are not directly runnable
 /// (they serve as blueprints).
+// @reserved: 暂无前端集成
 #[tauri::command]
 pub async fn pipeline_templates(
     state: State<'_, Arc<PipelineState>>,