[Feature] Label widget

[vmarcella]

Overview

Add a label widget for displaying static or dynamic text in the UI.

Current State

No response

Scope

Goals:

• Display text string
• Configurable text alignment
• Dynamic text updates
• Optional text wrapping

Non-Goals:

• Rich text
• Editable text

Proposed API

pub struct Label {
  text: String,
  font_size: f32,
  color: [f32; 4],
  align: TextAlign,
  wrap: bool,
}

impl Label {
  pub fn new(text: &str) -> Self;
  pub fn with_size(self, size: f32) -> Self;
  pub fn with_color(self, color: [f32; 4]) -> Self;
  pub fn with_align(self, align: TextAlign) -> Self;
  pub fn with_wrap(self, wrap: bool) -> Self;
  pub fn set_text(&mut self, text: &str);
  pub fn text(&self) -> &str;
}

impl Widget for Label {
  fn render(&self, ctx: &mut UiRenderContext) -> Vec<RenderCommand>;
  // Labels don't need complex hit testing
}

Acceptance Criteria

• Label displays text
• Font size configurable
• Text color configurable
• Alignment options work
• Text updates reflect immediately

Affected Crates

lambda-rs

Notes

• Consider caching text layout for performance
• May need to relayout when bounds change