Fix HTML Preview Tool critical bugs: PreviewFrame ref and click handler

- Fixed missing ref={previewFrameRef} on first PreviewFrame component (line 336)
  * This was causing 'PreviewFrame API not available' errors during save operations
  * Both fullscreen and normal mode PreviewFrame instances now have proper ref connection

- Fixed click handler attachment bug in setupInspectModeStyles function
  * Click handler was being skipped when styles were already injected
  * Now always attaches click handler when inspect mode is activated
  * Added proper cleanup to prevent duplicate event listeners

- Fixed variable scope issues in PreviewFrame.fresh.js
  * styleElement and cursorStyleElement now properly scoped for cleanup function
  * Added references to existing elements when styles already present

- Removed unused variables and fixed eslint warnings
  * Removed unused indentSize variable in BeautifierTool.js
  * Removed unused onSave and onDomUpdate props in PreviewFrame.fresh.js
  * Fixed unnecessary escape character in script tag

These fixes restore the Enhanced Option A DOM manipulation architecture:
- Inspector sidebar should now appear when clicking elements in inspect mode
- Save functionality should work without 'PreviewFrame ref not available' errors
- Live editing of element properties should work through PreviewFrame API
- Iframe refresh prevention during inspector operations maintained

.windsurf/rules/developer-tools.md

@@ -0,0 +1,13 @@
+---
+trigger: always_on
+---
+
+keep look the issue globally, not narrow. we are done chasing symtomp with narrow sight, we have things to be achieved:
+A. main goal: having a working HTML Preview with element inspector and editor feature, and 
+B. sub goal: implementing the "stable option A DOM Manipulation" properly to reach the main goal (A)
+
+In every reported issue, check if that prevent us to achieved the sub goal. Failing sub goal means fail to reach the main goal. So pivot everything to make a success sub goal, to achieve main goal. 
+
+I believe promised sub goal is the way to get succeed on the main goal.
+
+Avoid any looping thought