Add Markdown support

internal/service/static/js/wakelock.js

@@ -0,0 +1,49 @@
+/**
+ * WakeLock manages the screen wake lock to prevent the display from
+ * dimming during active use (recording or processing).
+ */
+export class WakeLock {
+  constructor() {
+    this.wakeLock = null;
+  }
+
+  /**
+   * acquire requests a screen wake lock. Idempotent.
+   */
+  async acquire() {
+    if (this.wakeLock) return;
+    if (!('wakeLock' in navigator)) return;
+
+    try {
+      this.wakeLock = await navigator.wakeLock.request('screen');
+    } catch (e) {
+      console.debug('wake lock acquire failed:', e);
+    }
+  }
+
+  /**
+   * release releases the active wake lock. Idempotent.
+   */
+  async release() {
+    if (!this.wakeLock) return;
+
+    try {
+      await this.wakeLock.release();
+    } catch (e) {
+      console.debug('wake lock release failed:', e);
+    }
+
+    this.wakeLock = null;
+  }
+
+  /**
+   * handleVisibilityChange reacquires the wake lock when the tab
+   * becomes visible, if the app is currently active.
+   * @param {boolean} isActive - Whether the app is recording or processing.
+   */
+  async handleVisibilityChange(isActive) {
+    if (document.visibilityState !== 'visible') return;
+    if (!isActive) return;
+    await this.acquire();
+  }
+}