refactor(modules): rename home module to draw, restore first-tab order

The Home tab was already titled "Draw"; rename the module to match:
folder modules/home → modules/draw, HomeModule → DrawModule, id "home"
→ "draw". The inner draw/ command folder is kept (modules::draw::draw).

Update build.rs PRIORITY ("home" → "draw") so the tab returns to the
front of the ribbon; registry.rs regenerates accordingly.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/modules/annotate/mod.rs

@@ -38,7 +38,7 @@ impl CadModule for AnnotateModule {
     }
 
     fn ribbon_groups(&self) -> Vec<RibbonGroup> {
-        use crate::modules::home::draw::{revcloud, wipeout};
+        use crate::modules::draw::draw::{revcloud, wipeout};
 
         vec![
             // ── Text ─────────────────────────────────────────────────────