feat: Object Editor Preview Mode & Mobile Optimizations

Major Enhancements:
- Added Preview/Edit mode toggle to StructuredEditor component
  * Preview mode: Read-only view with full text visibility
  * Edit mode: Full editing capabilities with all controls
  * Toggle positioned below title, responsive on mobile
  * Works in both main ObjectEditor view and nested modals

- Clickable nested data in Preview mode
  * JSON/serialized values are blue and clickable
  * Opens modal directly without switching to Edit mode
  * Hover effects and tooltips for better UX
  * No longer need edit mode just to explore structure

Mobile Responsiveness Improvements:
- Fixed all data load notices in ObjectEditor (URL, Paste, Open tabs)
- Fixed all data load notices in TableEditor (URL, Paste, Open tabs)
- Notices now stack vertically on mobile with proper spacing
- Added break-words for long text, whitespace-nowrap for buttons
- Dark mode colors added for better visibility

Table Editor Fixes:
- Fixed sticky header showing row underneath (top-[-1px])
- Made Export section header mobile responsive
- Updated object modal footer layout:
  * Format info and properties combined on single line
  * Buttons moved to separate row below
  * Changed 'Apply Changes' to 'Save Changes' for consistency

StructuredEditor Improvements:
- Moved overflow-x handling from ObjectEditor to StructuredEditor
- Now works consistently in main view and nested modals
- Long strings scroll horizontally everywhere
- 'Add Property' button hidden in Preview mode
- Improved chevron colors for dark mode visibility

Technical Changes:
- StructuredEditor now manages its own editMode state
- readOnly prop can still be passed from parent if needed
- Proper conditional rendering for all UI elements
- Consistent mobile-first responsive design patterns

public/data/commits.json

@@ -1,5 +1,16 @@
 {
   "changelog": [
+    {
+      "date": "2025-10-15",
+      "changes": [
+        {
+          "datetime": "2025-10-15T22:32:00+07:00",
+          "type": "enhancement",
+          "title": "Object Editor Preview Mode & Mobile Optimizations",
+          "description": "Added Preview/Edit mode toggle to Object Editor's Tree View with read-only preview mode for better data visibility. Implemented clickable nested data values in preview mode - no need to switch to edit mode to explore JSON/serialized structures. Fixed mobile responsiveness for all data load notices across Object and Table editors. Improved Table Editor sticky header positioning and export section layout on mobile. Moved horizontal overflow handling from ObjectEditor to StructuredEditor component for consistent behavior in main view and nested modals. Updated TableEditor object modal footer layout and changed 'Apply Changes' to 'Save Changes' for UX consistency."
+        }
+      ]
+    },
     {
       "date": "2025-10-14",
       "changes": [