Editing Experience Improvements & Stability Fixes

Popup cleanup refined: Clearer descriptions and more intuitive feedback for popup/overlay cleanup.
Simplified paste mode: Merged into a single toggle — plain text by default, one click to keep styles.
Smart download adaptation: HTML downloads now auto-detect email vs. web content for optimal cleanup.
Toolbar streamlined: Removed redundant buttons for a cleaner editing interface.
Editor performance boost: Core components restructured for faster overall response.

Preview button fix: Fixed preview button not responding on code paste and email signature pages.
Faster template loading: Fixed slow loading after selecting a template.
Image editing fix: Fixed inability to select or edit images with special structures (e.g. site logos).
Heavy page loading fix: Fixed browser freezing when loading pages with complex stylesheets.
Legacy browser support: Fixed features being unavailable on older browsers.
Post-update loading fix: Fixed resource loading failures in stale browser tabs after updates.
Context menu fix: Fixed occasional errors during right-click menu operations.
Dialog stability fix: Fixed occasional crashes when rapidly interacting with dialogs.

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