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]>

build.rs

@@ -23,7 +23,7 @@ use std::fs;
 use std::path::Path;
 
 // Display order for known modules; unknown modules follow alphabetically.
-const PRIORITY: &[&str] = &["home", "model", "insert", "annotate", "view", "manage"];
+const PRIORITY: &[&str] = &["draw", "model", "insert", "annotate", "view", "manage"];
 
 fn main() {
     // Windows: embed AppIcon.ico into the .exe so the executable carries its