Normalize Cards tab icon sizes

- Pad non-square SVG viewBoxes to square for consistent scaling
- Remove root width/height attributes from permanent.svg and refresh.svg
  so the square viewBox drives intrinsic aspect ratio
- Fine-tune individual icon sizes: persistent +20%, lost -10%, flip +10%

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: asimone

assets/icons/flip.svg

@@ -894,7 +894,7 @@ <h2 class="section-header">Card use</h2>
   <!-- LOST -->
   <div class="card">
     <div class="card-header">
-      <img src="assets/icons/lost.svg" class="badge-img" alt="Lost icon">
+      <img src="assets/icons/lost.svg" class="badge-img" alt="Lost icon" style="width:43px;height:43px">
       <div class="card-meta">
         <div class="card-title">Lost</div>
         <span class="card-sub">Card usage</span>
@@ -909,7 +909,7 @@ <h2 class="section-header">Card use</h2>
   <!-- PERSISTENT -->
   <div class="card">
     <div class="card-header">
-      <img src="assets/icons/permanent.svg" class="badge-img" alt="Persistent icon">
+      <img src="assets/icons/permanent.svg" class="badge-img" alt="Persistent icon" style="width:58px;height:58px">
       <div class="card-meta">
         <div class="card-title">Persistent</div>
         <span class="card-sub">Card usage</span>
@@ -969,7 +969,7 @@ <h2 class="section-header">Card use</h2>
   <!-- FLIP -->
   <div class="card">
     <div class="card-header">
-      <img src="assets/icons/flip.svg" class="badge-img" alt="Flip icon">
+      <img src="assets/icons/flip.svg" class="badge-img" alt="Flip icon" style="width:53px;height:53px">
       <div class="card-meta">
         <div class="card-title">Flip</div>
         <span class="card-sub">Item usage</span>