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 <[email protected]>

src/entities/multileader.rs

@@ -1328,7 +1328,7 @@ impl MultiLeaderTess for MultiLeader {
                 let _ = ml.block_connection_type;
                 for sub in synth_ins.explode_from_document(document) {
                     let normalized =
-                        crate::modules::home::modify::explode::normalize_insert_entity(sub);
+                        crate::modules::draw::modify::explode::normalize_insert_entity(sub);
                     let mut sub_wires = tessellate(
                         document,
                         handle,