fix(mobile): eliminate contenteditable bottom padding in dashboard v2 widgets

PROBLEM: 1x1 mobile widgets displayed poorly with excessive vertical spacing
ROOT CAUSE: Conflicting @media (max-width: 768px) set min-height: 2.75rem on all .rpg-editable

FIXES:
- Remove conflicting 768px media query min-height rule
- Add line-height: 1.2, min-height: 0, height: auto to .rpg-editable
- Use display: block for single-line fields instead of -webkit-box
- GridEngine detects mobile viewport (≤1000px) for 3.5rem rowHeight
- mobile.js skips old tab setup when Dashboard v2 exists
- Hide weather forecast label on mobile (shows icon text only)
- Fix weather text wrapping with white-space: nowrap

AFFECTED:
- style.css: Mobile contenteditable spacing, weather widget, widget scaling
- gridEngine.js: Mobile rowHeight detection (isMobileViewport)
- mobile.js: Skip mobile tabs when Dashboard v2 present

src/systems/ui/mobile.js

@@ -509,6 +509,13 @@ export function setupMobileTabs() {
     const isMobile = window.innerWidth <= 1000;
     if (!isMobile) return;
 
+    // Check if Dashboard v2 is present - if so, skip mobile tabs (dashboard has its own tab system)
+    const $dashboardContainer = $('#rpg-dashboard-container');
+    if ($dashboardContainer.length > 0) {
+        console.log('[RPG Mobile] Dashboard v2 detected - skipping old mobile tabs setup');
+        return;
+    }
+
     // Check if tabs already exist
     if ($('.rpg-mobile-tabs').length > 0) return;