feat(bg-studio): annotation popovers, crop overlay, redesigned contro…

[amardelta4]

…ls, themed scrollbars

Phase 1-3 additions to the BG Studio editor:

• Annotation toolbar: hover popovers above Arrow / Brush / Counter buttons for color/size/style defaults; arrow line + head styles; brush modes (pencil/highlighter/blur); counter formats (number/roman/alpha) + start-at.
• Crop tool: inline CleanShot-style overlay (8 handles, dim mask, rule-of-thirds, live W×H, ratio presets, Enter/Esc); SVG-mask renderer composes nested crops correctly. Lives in new CropOverlay.tsx.
• Pixelate redaction now reads as mosaic (blur + contrast + grid overlay).
• Export: copy-to-clipboard, JPEG/WebP with quality slider, social-media aspect-ratio presets, drag-drop + paste image import, crop/zoom reset during capture so overlay UI never bakes into the output.
• Undo/redo: full state snapshot incl. uploadedImages (crop) and brushes; redo stack with Ctrl+Z / Ctrl+Y / Ctrl+Shift+Z; toolbar Redo button.
• Viewport: Ctrl+scroll canvas zoom, click-drag pan, scrollbars adapt to zoom; default alignment switched to middle-center.
• Controls: tab-based icon nav (Image/Background/Effects/Devices), compact canvas-size pill in header, "More options" toggle for advanced controls, sticky export bar at bottom.
• Misc: adjustable canvas corner radius (ring follows curve), themed scrollbars across the app, fix package.json stray '+' typo.

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