feat: Add preset management system for tracker configurations

- Add preset selector dropdown in tracker editor modal
- Support creating, loading, and deleting presets
- Add per-character/group preset associations with auto-switch
- Add default preset functionality with star button
- Update import to offer 'Apply to Current' or 'Create New Preset' options
- Add preset management UI styles and import dialog styles

src/core/state.js

@@ -250,6 +250,18 @@ export let extensionSettings = {
             recentEvents: false // Boolean for recent events widget lock
         },
         characters: {}          // Object mapping character names to their locked fields (e.g., {"Sarah": {relationship: true, thoughts: false}})
+    },
+    // Preset management for tracker configurations
+    presetManager: {
+        // Map of preset ID to preset data (contains name and trackerConfig)
+        presets: {},
+        // Map of character/group entity to preset ID (e.g., "char_0": "preset_123", "group_abc": "preset_456")
+        // Note: This is stored separately and NOT exported with presets
+        characterAssociations: {},
+        // Currently active preset ID
+        activePresetId: null,
+        // Default preset ID (used when no character association exists)
+        defaultPresetId: null
     }
 };