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

locales/en.json

@@ -204,6 +204,9 @@
         },
         "filter": {
             "title": "Filter Models",
+            "presets": "Presets",
+            "savePreset": "Save current active filters as a new preset (first select filters below, then click here)",
+            "noPresets": "No presets saved yet. Select filters below and click + to save",
             "baseModel": "Base Model",
             "modelTags": "Tags (Top 20)",
             "modelTypes": "Model Types",