Feature/led

[kusarparlly]

Summary

This PR introduces AtomUI.Labs.Controls.Led, an experimental LED-style display control package for AtomUI applications.

The package contains two independent display models:

• SegmentDisplay: a fourteen-segment display for numbers, Latin letters, common symbols, instrument-style readouts, and digital panel UI.
• MatrixDisplay: a fixed 5x7 dot-matrix display for LED text panels, symbol display, glow effects, and basic marquee scenarios.

AtomUI.Labs.Controls.Led is packaged as an independent Labs control library. It depends directly on Avalonia and AtomUI.Core, without taking
dependencies on the existing AtomUI desktop control packages.

What is included

• Independent Led control package, theme provider, and UseLed() registration entry.
• Segment display implementation with character normalization, fourteen-segment mapping, layout, alignment, overflow handling, inactive segments,
  theme defaults, and glow rendering.
• Matrix display implementation with 5x7 glyphs, configurable dot shape, panel border, alignment, overflow handling, Unicode fallback, glow
  rendering, and single-direction marquee support.
• Shared Led family primitives for common input normalization and layout math, while keeping Segment and Matrix rendering models separate.
• Gallery examples for Segment and Matrix covering basic usage, visual configuration, overflow behavior, dynamic values, glow, and marquee.
• Documentation for the Led family design, implementation boundaries, glow strategy, matrix marquee contract, and performance validation notes.

Validation

The PR includes automated coverage for:

• Segment character mapping, layout, measurement, rendering, theme behavior, automation, and geometry lifecycle.
• Matrix glyph mapping, dot geometry, layout, measurement, rendering, border behavior, dynamic loading, marquee lifecycle, Unicode fallback, and
  automation.
• Shared Led layout utilities and character normalization.
• Glow rendering behavior and Gallery glow workbench lifecycle.

Notes

• The package is experimental and public APIs may evolve with Labs feedback.
• The scope is visual LED-style display controls only; it does not target hardware LED control, rich text layout, complex script shaping, or a
  single merged “universal” LED control.

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