feat(dashboard): integrate tracker editor with widget system

Implemented hierarchical customization where trackerConfig controls content
(fields, names, AI instructions) and dashboard controls layout (positioning,
tabs, widget instances). Both systems now work together instead of conflicting.

**Widget Integration:**
- userStatsWidget: Respects trackerConfig for stat names and enable/disable
- userStatsWidget: Supports per-widget stat filtering via config.visibleStats
- userStatsWidget: Dynamically generates config options from trackerConfig
- infoBoxWidgets: All widgets (calendar, weather, temperature, clock, location)
  check trackerConfig.infoBox.widgets.*.enabled before rendering
- Widgets show "disabled" state with link to Tracker Settings when field disabled

**Dashboard UI:**
- Added Tracker Settings button to dashboard header (sliders icon)
- Button opens tracker editor modal for global field configuration
- Button positioned next to Edit Layout for clear separation of concerns

**Tracker Editor:**
- Added help text explaining relationship with dashboard system
- Help text clarifies: Tracker Settings = content, Edit Layout = positioning
- Styled with info banner at top of modal

**Migration:**
- Enhanced migrateV1ToV2Dashboard() to respect trackerConfig
- Removes userStats widget if all stats disabled in trackerConfig
- Removes presentCharacters widget if thoughts disabled in trackerConfig
- Ensures smooth upgrade path from v1.x

**CSS:**
- Added .rpg-editor-help styling for tracker editor help banner
- Added .rpg-widget-empty-state for disabled widget messaging
- Info-style banner with icon and clear typography

**Result:**
Two-level customization system:
1. Tracker Settings (global): What fields exist, their names, AI instructions
2. Edit Layout (local): Where widgets appear, per-widget overrides

Files modified:
- src/systems/dashboard/widgets/userStatsWidget.js (+75 lines)
- src/systems/dashboard/widgets/infoBoxWidgets.js (+67 lines)
- src/systems/dashboard/dashboardIntegration.js (+15 lines)
- src/systems/dashboard/dashboardTemplate.html (+4 lines)
- src/systems/dashboard/defaultLayout.js (+22 lines)
- template.html (+6 lines)
- style.css (+58 lines)

src/systems/dashboard/defaultLayout.js

@@ -225,20 +225,32 @@ export function migrateV1ToV2Dashboard(oldSettings) {
     // Respect user's visibility preferences from v1.x
     const statusTab = dashboard.tabs[0];
 
-    // Remove widgets that were hidden in v1.x
-    if (!oldSettings.showUserStats) {
+    // Check trackerConfig for field-level disabling
+    const trackerConfig = oldSettings.trackerConfig;
+
+    // Remove userStats widget if hidden in v1.x OR all stats disabled in trackerConfig
+    const allStatsDisabled = trackerConfig?.userStats?.customStats
+        ?.every(stat => !stat.enabled) ?? false;
+
+    if (!oldSettings.showUserStats || allStatsDisabled) {
         statusTab.widgets = statusTab.widgets.filter(w => w.type !== 'userStats');
-        console.log('[DefaultLayout] Removed userStats widget (was hidden in v1.x)');
+        console.log('[DefaultLayout] Removed userStats widget', allStatsDisabled ? '(all stats disabled in trackerConfig)' : '(was hidden in v1.x)');
     }
 
+    // Remove infoBox widget if hidden in v1.x
+    // Note: We keep individual info widgets (calendar, weather, etc.) even if fields are disabled
+    // because widgets will show disabled state with link to Tracker Settings
     if (!oldSettings.showInfoBox) {
         statusTab.widgets = statusTab.widgets.filter(w => w.type !== 'infoBox');
         console.log('[DefaultLayout] Removed infoBox widget (was hidden in v1.x)');
     }
 
-    if (!oldSettings.showCharacterThoughts) {
+    // Remove presentCharacters widget if hidden in v1.x OR thoughts disabled in trackerConfig
+    const thoughtsDisabled = trackerConfig?.presentCharacters?.thoughts?.enabled === false;
+
+    if (!oldSettings.showCharacterThoughts || thoughtsDisabled) {
         statusTab.widgets = statusTab.widgets.filter(w => w.type !== 'presentCharacters');
-        console.log('[DefaultLayout] Removed presentCharacters widget (was hidden in v1.x)');
+        console.log('[DefaultLayout] Removed presentCharacters widget', thoughtsDisabled ? '(thoughts disabled in trackerConfig)' : '(was hidden in v1.x)');
     }
 
     // Remove inventory tab if it was hidden in v1.x