feat(phase9): extract_content_tags_cmd Tauri wrapper

Bridges LlmEngine::extract_content_tags to the frontend with the same
spawn_blocking + PowerAssertion guard the cleanup_text command uses.
Returns a ContentTags object serialised to camelCase JSON. Errors
surface as readable strings so the frontend toast shows actionable
text on the rare grammar-bypass path.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src-tauri/src/commands/llm.rs

@@ -6,7 +6,7 @@ use crate::AppState;
 use kon_ai_formatting::{llm_cleanup_text, LlmPromptPreset};
 use kon_core::hardware;
 use kon_llm::model_manager::{self, model_info};
-use kon_llm::LlmModelId;
+use kon_llm::{ContentTags, LlmModelId};
 
 #[derive(Debug, serde::Serialize)]
 #[serde(rename_all = "camelCase")]
@@ -398,3 +398,26 @@ pub async fn cleanup_transcript_text_cmd(
     .map_err(|e| e.to_string())?
     .map_err(|e| e.to_string())
 }
+
+/// Phase 9 LLM-powered content tags. On-demand from the History page;
+/// never auto-runs. Heavy work (LlmEngine::extract_content_tags is
+/// synchronous llama-cpp inference) is wrapped in spawn_blocking so it
+/// does not stall the Tauri runtime, with the same App-Nap power
+/// assertion the other LLM commands use.
+#[tauri::command]
+pub async fn extract_content_tags_cmd(
+    state: State<'_, AppState>,
+    transcript: String,
+) -> Result<ContentTags, String> {
+    if !state.llm_engine.is_loaded() {
+        return Err("LLM not loaded. Download an AI model in Settings.".to_string());
+    }
+    let engine = state.llm_engine.clone();
+    tokio::task::spawn_blocking(move || {
+        let _power_guard = PowerAssertion::begin("kon LLM content-tag extraction");
+        engine.extract_content_tags(&transcript)
+    })
+    .await
+    .map_err(|e| e.to_string())?
+    .map_err(|e| e.to_string())
+}

src-tauri/src/lib.rs

@@ -373,6 +373,8 @@ pub fn run() {
             commands::clipboard::copy_to_clipboard,
             // Filesystem (Phase 9 save-dialog path)
             commands::fs::write_text_file_cmd,
+            // LLM content tags (Phase 9)
+            commands::llm::extract_content_tags_cmd,
             // Paste (auto-insert at cursor)
             commands::paste::paste_text,
             commands::paste::paste_text_replacing,