fix: auto-arrange now correctly recalculates widget grid layouts

Root Cause:
After auto-arrange reorganized widgets, code attempted to call onResize()
for ALL tabs' widgets. However, switchTab() clears the this.widgets Map
and only re-renders the current tab. Result: this.widgets.get(widgetId)
returned undefined for non-active tabs, so onResize() was never called.

Additionally, User Attributes onResize() was receiving grid units (2)
instead of pixel width (~290px), causing calculateOptimalColumns() to
think only 2 columns would fit when 3 columns could easily fit.

The Fix:
1. Iterate over this.widgets Map (currently rendered widgets only)
   instead of this.dashboard.tabs (includes non-rendered widgets)
2. Use container.offsetWidth (pixel width) in onResize instead of grid units
3. Enable DEBUG flags temporarily to reveal previously suppressed logs

Result:
- onResize() now called for all visible widgets after auto-arrange
- User Attributes correctly maintains 3×3 grid at 2 grid units wide
- No more 2×5 layout with orphaned last attribute

Fixes: User Attributes breaking into 2×5 grid after auto-arrange

src/systems/dashboard/gridEngine.js

@@ -9,7 +9,8 @@
  */
 
 // Performance: Disable console logging (console.error still active)
-const DEBUG = false;
+// Temporarily enabled for debugging auto-arrange onResize issue
+const DEBUG = true;
 const console = DEBUG ? window.console : {
     log: () => {},
     warn: () => {},