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>

assets/icons/dim_linear.svg

@@ -0,0 +1,13 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="64" height="64">
+  <!-- Measured object -->
+  <line x1="4" y1="18" x2="20" y2="18" stroke="#e0e0e0" stroke-width="1.5" stroke-linecap="round"/>
+  <!-- Extension lines -->
+  <line x1="4" y1="18" x2="4" y2="10" stroke="#e0e0e0" stroke-width="1" stroke-dasharray="1,1" stroke-linecap="round"/>
+  <line x1="20" y1="18" x2="20" y2="10" stroke="#e0e0e0" stroke-width="1" stroke-dasharray="1,1" stroke-linecap="round"/>
+  <!-- Dimension line with arrows -->
+  <line x1="4" y1="11" x2="20" y2="11" stroke="#4cc9f0" stroke-width="1.5" stroke-linecap="round"/>
+  <polygon points="4,11 7,9.5 7,12.5" fill="#4cc9f0"/>
+  <polygon points="20,11 17,9.5 17,12.5" fill="#4cc9f0"/>
+  <!-- Dimension text -->
+  <text x="12" y="9" text-anchor="middle" font-size="4" fill="#4cc9f0" font-family="monospace">12.5</text>
+</svg>