feat: add minimap hover preview with multi-line code preview

[Mohamed998788]

Summary

• Add a floating code preview that appears when hovering over the minimap
• Multi-line preview centered on the hovered line with highlighted center line
• Debounced rendering (default 300ms) for optimal performance on large files
• Automatic theme support via CSS custom variables (dark/light/high-contrast)
• Truncates long lines at 200 chars with ellipsis

New Settings

• editor.minimap.showHoverPreview (boolean, default true)
• editor.minimap.hoverPreviewDelay (number, default 300ms)
• editor.minimap.hoverPreviewMaxLines (number, default 5)

Files Changed

• src/vs/editor/browser/viewParts/minimap/minimap.ts - MinimapHoverPreview class + integration
• src/vs/editor/browser/viewParts/minimap/minimap.css - hover preview styles
• src/vs/editor/common/config/editorOptions.ts - new minimap settings

[Mohamed998788]

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