fix: Default to OCR mode on initial page load

- Fixed HTML initial state: OCR toggle button has 'active', OCR panel has 'active', barcode does not
- switchTab calls setAddAssetMode() which syncs visual panels AND starts the right camera
- Previously the JS variable was 'ocr' but HTML hardcoded barcode as active — visual mismatch

static/index.html

@@ -1238,12 +1238,12 @@
   <div id="tabAddAsset" class="tab-panel active">
     <!-- Mode Toggles -->
     <div class="mode-toggles">
-      <button class="mode-toggle active" data-mode="barcode" onclick="setAddAssetMode('barcode')"><svg class="gi" aria-hidden="true"><use href="#gi-camera"/></svg> Barcode</button>
+      <button class="mode-toggle" data-mode="barcode" onclick="setAddAssetMode('barcode')"><svg class="gi" aria-hidden="true"><use href="#gi-camera"/></svg> Barcode</button>
-      <button class="mode-toggle" data-mode="ocr" onclick="setAddAssetMode('ocr')"><svg class="gi" aria-hidden="true"><use href="#gi-search"/></svg> OCR</button>
+      <button class="mode-toggle active" data-mode="ocr" onclick="setAddAssetMode('ocr')"><svg class="gi" aria-hidden="true"><use href="#gi-search"/></svg> OCR</button>
     </div>
 
     <!-- ── BARCODE MODE ──────────────────────────────────────────────── -->
-    <div id="addBarcodeMode" class="add-mode active">
+    <div id="addBarcodeMode" class="add-mode">
       <div class="card">
         <div class="card-title">Barcode Scanner</div>
         <div id="cameraArea" class="camera-area">
@@ -1260,7 +1260,7 @@
     </div>
 
     <!-- ── OCR MODE ──────────────────────────────────────────────────── -->
-    <div id="addOcrMode" class="add-mode">
+    <div id="addOcrMode" class="add-mode active">
       <div class="card">
         <div class="card-title">OCR Scanner — Photograph Sticker</div>
         <div id="ocrCameraArea" class="camera-area">
@@ -2439,10 +2439,9 @@
         el.classList.toggle('active', el.dataset.tab === tabId);
       });
 
-      // Tab lifecycle hooks — start the appropriate scanner
+      // Tab lifecycle hooks — sync visual panel + start correct camera
       if (tabId === 'tabAddAsset') {
-        if (addAssetMode === 'ocr') startOcrCamera();
+        setAddAssetMode(addAssetMode);
-        else startScanning();
       } else {
         stopScanning();
       }