feat(dashboard): implement column-aware defaultSize for optimal 3-4 col widget layout

PROBLEM:
- Reset/auto-layout placed userInfo at 1x1, mood at [1,0] blocking expansion
- Expansion pass couldn't grow userInfo to 2x1 because mood already occupied column 1
- Result: 1x1 userInfo, 1x1 mood, empty space at [2,0] in 3-col layout

ROOT CAUSE:
- Static defaultSize 1x1 → placement happens first
- Expansion happens second, but mood blocks userInfo horizontal growth

SOLUTION - Column-aware defaultSize:
1. userInfoWidget.js: defaultSize now function of columns
   - Mobile (≤2 col): { w: 1, h: 1 } (compact, mood beside it)
   - Desktop (3-4 col): { w: 2, h: 1 } (starts at target size)

2. dashboardManager.js: resetWidgetSizesToDefault() supports function defaultSize
   - Calls defaultSize(columns) if function, otherwise uses static object
   - Same pattern as maxAutoSize support

3. widgetRegistry.js: Updated validation to accept function defaultSize
   - Skip validation for functions (can't validate until runtime)

4. dashboardManager.js: Reordered userWidgetOrder
   - mood(2) before stats(3) so mood sits beside userInfo in top row

RESULT (3-4 columns):
- userInfo starts at 2x1, placed at [0,0]
- mood placed at [2,0] (beside 2-wide userInfo)
- stats placed at [0,1] and expands to 3x? (full width below)
- No expansion blocking, no wasted space

MOBILE FIXES (from previous commits):
- Stats widget: padding-bottom 0.5rem (was 0.3rem, prevent Arousal clipping)
- Refresh button: Show with Dashboard v2 (#rpg-dashboard-container selector)
- Mood text: 0.6rem font-size (improve readability)

AFFECTED:
- userInfoWidget.js: defaultSize + maxAutoSize column-aware functions
- dashboardManager.js: resetWidgetSizesToDefault, userWidgetOrder
- widgetRegistry.js: Validation allows function defaultSize
- userStatsWidget.js: maxAutoSize column-aware (previous commit)
- style.css: Stats padding fix 0.5rem

style.css

@@ -4323,7 +4323,7 @@ body:has(.rpg-panel.rpg-position-left) #sheld {
 
     /* User Stats Widget - add bottom padding to prevent last bar (Arousal) from being clipped */
     .rpg-widget .rpg-stats-grid {
-        padding-bottom: 0.3rem !important;
+        padding-bottom: 0.5rem !important;
     }
 
     /* Mood Widget - increase conditions text size for readability */