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/draw/modify/delete.rs

@@ -0,0 +1,15 @@
+// Delete tool — ribbon definition.
+//
+// Fires the ERASE command (same as pressing Delete key or typing ERASE/E).
+// Shown as "Delete" in the ribbon so the label matches familiar terminology.
+
+use crate::modules::{IconKind, ModuleEvent, ToolDef};
+
+pub fn tool() -> ToolDef {
+    ToolDef {
+        id: "ERASE",
+        label: "Delete",
+        icon: IconKind::Svg(include_bytes!("../../../../assets/icons/erase.svg")),
+        event: ModuleEvent::Command("ERASE".to_string()),
+    }
+}