Redesigned Right Panel, Better Keyboard Navigation and Smarter File Management

🔄 Improvements

• Redesigned the right panel with compact tabs, smooth animations and thin scrollbars.
• Improved the Style tab with a more compact colour wheel, refined controls and a cleaner layout.
• Redesigned the Icons tab with picture management, drawing tools, icon size controls and smarter icon suggestions.
• Refined the Transcription panel with clearer typography, better spacing and expandable picture previews.
• Improved the centre idea layout: pictures appear as thumbnails, icons sit alongside them, and images can be expanded to full size.
• Improved keyboard navigation throughout the right panel, including tabs, icons, sliders and the colour wheel.
• Enhanced keyboard navigation in filter menus, including access to footer actions and settings.
• Improved context menu navigation and focus handling, preventing accidental actions on the map.
• Added smoother transitions between consecutive confirmation dialogs.
• Improved Files selection highlighting, especially for folders and dark themes.
• Improved Files grid selection controls and made better use of space for long folder names.
• Optimised map previews to avoid unnecessary regeneration when nothing has changed.
• Improved Files list performance and responsiveness during editing, saving and synchronisation.
• Automatically compacted floating layout cards when the available map space becomes narrow.
• Improved dark theme consistency across panels, menus and selection highlights.

✨ New Features

• Added sticky section headings to Files Home, making it easier to navigate long lists. Empty sections are automatically hidden during search and filtering.
• Added Cmd/Ctrl+Shift+E to open and close the right panel using the keyboard.
• Added picture previews directly in the Transcription panel, with expandable banners for closer inspection.

🛠 Fixes

• Fixed: Dragging branches no longer accidentally detaches them when moving between parents or rearranging siblings.
• Fixed: Fit Map and Fit to Width now correctly centre the map when the right panel is open.
• Fixed: Custom mind-map icons now appear correctly in exported map images.
• Fixed: Manually selected icons now appear correctly in the Transcription panel.
• Fixed: AI-generated and suggested icons now respect content restriction settings.
• Fixed: The Delete Note action now correctly removes notes and their icons.
• Fixed: Delete and Cmd/Ctrl+Backspace shortcuts work again in the Files panel.
• Fixed: File deletion confirmations now clearly warn that deletion cannot be undone.
• Fixed: Newly created accounts can open their first map in Electron without restarting.
• Fixed: Newly created, renamed and synchronised files appear reliably in the Files list during ongoing editing.
• Fixed: Switching maps during thumbnail saving no longer produces irrelevant error notifications.
• Fixed: Native scrollbars no longer appear alongside floating scrollbars on Windows and Linux.
• Fixed: The Files search field remains readable on dark map themes.
• Fixed: Dark theme text, notes, selected lines and context menu backgrounds display correctly.
• Fixed: The colour wheel outline no longer has a visible gap.
• Fixed: Misleading keyboard shortcut hints have been removed from filter menu headers.
• Fixed: Context menus and confirmation dialogs no longer trigger unintended map shortcuts.
• Fixed: Selection connectors no longer clutter the map when multiple branches are selected.
• Fixed: Tooltips no longer overlap context menus, and full-name tooltips appear only for truncated filenames.

And other improvements