fix: update widget sizing for 1080p screens - Scene, Inventory, and Quests tabs

**Scene Tab (presentCharacters):**
- Desktop: 3×2 (wide and short, fits 1080p viewport)
- Mobile: 2×4 (narrow and tall for vertical stacking)

**Inventory Tab:**
- Desktop: 3×7 (full width, spacious) instead of 2×6
- Mobile: 2×5 (full width, compact)

**Quests Tab:**
- Desktop: 3×7 (full width, spacious) instead of 2×5
- Mobile: 2×5 (full width, compact)

All widgets now use full width at their respective column counts and
are properly sized to fit within 1080p screens without scrolling off.

src/systems/dashboard/defaultLayout.js

@@ -112,14 +112,14 @@ export function generateDefaultDashboard() {
                             maxEvents: 3
                         }
                     },
-                    // Row 5-8: Present Characters (full width, tall for cards)
+                    // Row 5-6: Present Characters (full width, fits 1080p screen)
                     {
                         id: 'widget-presentchars',
                         type: 'presentCharacters',
                         x: 0,
                         y: 5,
                         w: 3,
-                        h: 4,
+                        h: 2,
                         config: {
                             cardLayout: 'grid',
                             showThoughtBubbles: true