feat: redesign Annotate ribbon tab with proper groups and SVG icons

Added 15 SVG icons for all annotation tools (dimensions, leaders,
table, wipeout, revision cloud, tolerance, ddedit).

Annotate ribbon now has 6 groups matching standard CAD layout:
- Text: MText (large dropdown) + Text + Edit Text
- Dimensions: Linear (large dropdown with 6 types) + Continue + Baseline + Tolerance
- Leaders: Multileader (large dropdown) + Leader
- Tables: Table (large)
- Markup: Wipeout + Rev Cloud
- Annotation Scaling: Scale List, Add Scale, Scale Edit, Sync Scales

Added pub tool() + ICON to all annotate tools that were missing them
(aligned_dim, diameter_dim, dim_continue, dim_baseline, table_cmd,
tolerance_cmd, ddedit), and to home/draw/wipeout and revcloud.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/modules/annotate/angular_dim.rs

@@ -7,7 +7,7 @@ use crate::modules::{IconKind, ModuleEvent, ToolDef};
 use crate::scene::wire_model::WireModel;
 use glam::Vec3;
 
-pub const ICON: IconKind = IconKind::Glyph("∠");
+pub const ICON: IconKind = IconKind::Svg(include_bytes!("../../../assets/icons/dim_angular.svg"));
 
 pub fn tool() -> ToolDef {
     ToolDef {