feat(text-tool): implement Photoshop-style on-canvas text editor

- Replaced modal dialog with inline on-canvas text editor
- Text objects stored as editable entities (non-rasterized)
- Live preview with transparent textarea overlay
- Click on existing text to re-edit
- Drag transform handles to move text
- Auto-commit on click outside (via overlay)
- Text selection with visible highlight
- Hidden original text during editing to prevent double vision
- Position alignment fixes for editing existing text
- Keyboard shortcuts: Ctrl+Enter to commit, Escape to cancel

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

components/editor/editor-layout.tsx

@@ -9,7 +9,6 @@ import { ToolOptions } from './tool-options';
 import { PanelDock } from './panel-dock';
 import { ThemeToggle } from './theme-toggle';
 import { ToolPalette } from '@/components/tools';
-import { TextDialog } from '@/components/modals/text-dialog';
 import { useKeyboardShortcuts } from '@/hooks/use-keyboard-shortcuts';
 import { useFileOperations } from '@/hooks/use-file-operations';
 import { useDragDrop } from '@/hooks/use-drag-drop';
@@ -191,9 +190,6 @@ export function EditorLayout() {
         {/* Right: Panel Dock */}
         <PanelDock />
       </div>
-
-      {/* Text Dialog */}
-      <TextDialog />
     </div>
   );
 }