feat: 美化整体UI

[DymoneLewis]

详细改动点晚点补充

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[Copilot]

Pull request overview

This PR implements comprehensive UI beautification for the LogicFlow library, focusing on modernizing visual styling, improving component design, and enhancing the grid system.

Key Changes:

1. Visual Design Updates: Increased border-radius values (5px → 8px), refined spacing/padding, updated shadows and colors
2. Theme Mode Support: Added dark mode support with themed class names (lf-control-${themeMode})
3. Grid System Enhancements: New advanced grid configuration with major/bold line support and dynamic dash patterns
4. Geometry Utilities: New generateRoundedCorners function for consistent rounded corners across shapes
5. Control Panel Improvements: Optional text hiding, improved icon styling, and responsive layout

Reviewed changes

Copilot reviewed 28 out of 28 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
style/raw.ts, style/index.less	Updated CSS with modern styling: 8px radius, refined spacing, shadow updates, theme support
components/control/index.ts	Added hideText option for controls, theme mode class integration
util/geometry.ts	New generateRoundedCorners utility for universal corner rounding
view/overlay/Grid.tsx	Enhanced grid with major/bold lines, dynamic dash patterns, period-based rendering
view/overlay/gridConfig.ts	New grid configuration system with validation and merging logic
view/overlay/OutlineOverlay.tsx	Refactored outline rendering, adjusted offsets (10→4 for nodes, improved edge handling)
view/shape/Polygon.tsx	Integrated generateRoundedCorners, fixed typo (classNmae → className)
view/edge/PolylineEdge.tsx	Applied universal corner rounding to polyline edges
view/node/HtmlNode.tsx	Added shadow filter support and rect background
view/Control.tsx	Adjusted resize control positioning and sizing
util/theme.ts	Refactored theme system, extracted theme constants
util/edge.ts	Enhanced getBBoxOfPoints with separate height offset
constant/theme.ts	New theme constants file (not shown in diff)

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