frontend: add force rescan to button and watch status display

- Send force: true in scan API request body
- Rename 'Scan Library' button to 'Rescan Library'
- Replace Settings card with Watch Status display
- Add loadWatchStatus() to fetch and display watch mode status
- Remove inline script from admin.templ (moved to admin.ts)

web/src/admin.ts

@@ -128,7 +128,11 @@ async function scanAllLibraries(): Promise<void> {
         for (const lib of libraries) {
             const scanResp = await fetch(`/api/libraries/${lib.id}/scan`, {
                 method: 'POST',
-                headers: { 'Authorization': `Bearer ${token}` }
+                headers: { 
+                    'Authorization': `Bearer ${token}`,
+                    'Content-Type': 'application/json'
+                },
+                body: JSON.stringify({ force: true })
             });
 
             if (scanResp.ok) {
@@ -289,8 +293,33 @@ function hideScanProgress(): void {
     if (container) container.classList.add('hidden');
 }
 
+async function loadWatchStatus(): Promise<void> {
+    const token = localStorage.getItem('token');
+    if (!token) return;
+
+    try {
+        const response = await fetch('/api/scanner/watch/status', {
+            headers: { 'Authorization': `Bearer ${token}` }
+        });
+        if (response.ok) {
+            const data = await response.json();
+            const countEl = document.getElementById('watch-count');
+            if (countEl) {
+                countEl.textContent = data.total_watching?.toString() || '0';
+            }
+        }
+    } catch (error) {
+        console.error('Failed to load watch status:', error);
+    }
+}
+
+document.addEventListener('DOMContentLoaded', function() {
+    loadWatchStatus();
+});
+
 (window as any).triggerLibraryScan = triggerLibraryScan;
 (window as any).triggerQuickScan = triggerQuickScan;
 (window as any).loadSystemStats = loadSystemStats;
 (window as any).scanAllLibraries = scanAllLibraries;
+(window as any).loadWatchStatus = loadWatchStatus;
 (window as any).hideScanProgress = hideScanProgress;