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/inquiry/dist.rs

@@ -0,0 +1,83 @@
+// DIST command — measure distance and angle between two picked points.
+
+use glam::Vec3;
+
+use crate::command::{CadCommand, CmdResult};
+use crate::scene::model::wire_model::WireModel;
+
+pub struct DistCommand {
+    first: Option<Vec3>,
+}
+
+impl DistCommand {
+    pub fn new() -> Self {
+        Self { first: None }
+    }
+}
+
+impl CadCommand for DistCommand {
+    fn name(&self) -> &'static str {
+        "DIST"
+    }
+
+    fn prompt(&self) -> String {
+        if self.first.is_none() {
+            "DIST  Specify first point:".into()
+        } else {
+            "DIST  Specify second point:".into()
+        }
+    }
+
+    fn on_point(&mut self, pt: Vec3) -> CmdResult {
+        if let Some(p1) = self.first {
+            let delta = pt - p1;
+            let dist = delta.length();
+            let dx = delta.x;
+            let dy = delta.y; // drawing plane is world XY
+            let dz = delta.z; // elevation
+
+            // Angle in XY plane — degrees from +X
+            let angle_xy = dy.atan2(dx).to_degrees();
+            // Angle from XY plane toward Z (elevation angle)
+            let dist_xy = dx.hypot(dy);
+            let angle_z = dz.atan2(dist_xy).to_degrees();
+
+            let msg = format!(
+                "Distance = {dist:.4},  Angle in XY Plane = {angle_xy:.4}°,  Angle from XY Plane = {angle_z:.4}°\n  Delta X = {dx:.4},  Delta Y = {dy:.4},  Delta Z = {dz:.4}",
+            );
+            CmdResult::Measurement(msg)
+        } else {
+            self.first = Some(pt);
+            CmdResult::NeedPoint
+        }
+    }
+
+    fn on_enter(&mut self) -> CmdResult {
+        CmdResult::Cancel
+    }
+
+    fn on_mouse_move(&mut self, pt: Vec3) -> Option<WireModel> {
+        let p1 = self.first?;
+        Some(WireModel {
+            name: "dist_preview".into(),
+            points: vec![[p1.x, p1.y, p1.z], [pt.x, pt.y, pt.z]],
+            color: WireModel::CYAN,
+            selected: false,
+            pattern_length: 0.0,
+            pattern: [0.0; 8],
+            line_weight_px: 1.0,
+            snap_pts: vec![],
+            tangent_geoms: vec![],
+            aci: 0,
+            key_vertices: vec![],
+            aabb: WireModel::UNBOUNDED_AABB,
+            plinegen: true,
+            vp_scissor: None,
+            fill_tris: vec![],
+        })
+    }
+}
+
+
+// ── Autocomplete registry ─────────────────────────────────
+inventory::submit!(crate::command::CommandRegistration { names: &["DI", "DIST"] });  // DistCommand