feat: add filter preset system

Add ability to save and manage filter presets for quick access to commonly used filter combinations.

Features:
- Save current active filters as named presets
- Apply presets with one click (shows active state with checkmark)
- Toggle presets on/off like regular filters
- Delete presets
- Presets stored in browser localStorage per page
- Default "WAN Models" preset for LoRA page
- Visual feedback: active preset highlighted, filter tags show blue outlines
- Inline "+ Add" button flows with preset tags

UI/UX improvements:
- Preset tags use same compact style as filter tags
- Active preset deactivates when filters manually changed
- Missing tags from presets automatically added to tag list
- Clear filters properly resets preset state

templates/components/header.html

@@ -135,6 +135,15 @@
       <i class="fas fa-times"></i>
     </button>
   </div>
+
+  <!-- Presets Section -->
+  <div class="filter-section presets-section">
+    <h4>{{ t('header.filter.presets') }}</h4>
+    <div class="filter-presets" id="filterPresets">
+      <div class="no-presets">{{ t('header.filter.noPresets') }}</div>
+    </div>
+  </div>
+
   <div class="filter-section">
     <h4>{{ t('header.filter.baseModel') }}</h4>
     <div class="filter-tags" id="baseModelTags">