Co-locate CadCommand impls with their ribbon toolbar modules

Each command implementation is now in the same file as its ribbon
tool definition. Groups moved to a dedicated groups/ toolbar folder.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/modules/home/properties/match_prop.rs

@@ -1,4 +1,4 @@
-// Match Properties tool — ribbon definition.
+// Match Properties tool — ribbon definition + CadCommand implementation.
 
 use crate::modules::{IconKind, ModuleEvent, ToolDef};
 
@@ -10,3 +10,82 @@ pub fn tool() -> ToolDef {
         event: ModuleEvent::Command("MATCHPROP".to_string()),
     }
 }
+
+// ── CadCommand implementation ─────────────────────────────────────────────
+
+use acadrust::Handle;
+use glam::Vec3;
+
+use crate::command::{CadCommand, CmdResult};
+use crate::scene::wire_model::WireModel;
+
+pub struct MatchPropCommand {
+    /// Source handle; NULL until phase 1 is complete.
+    src: Handle,
+}
+
+impl MatchPropCommand {
+    pub fn new() -> Self {
+        Self { src: Handle::NULL }
+    }
+
+    fn phase1_done(&self) -> bool {
+        !self.src.is_null()
+    }
+}
+
+impl CadCommand for MatchPropCommand {
+    fn name(&self) -> &'static str {
+        "MATCHPROP"
+    }
+
+    fn prompt(&self) -> String {
+        if !self.phase1_done() {
+            "MATCHPROP  Select source object:".into()
+        } else {
+            "MATCHPROP  Select destination objects (Enter to apply):".into()
+        }
+    }
+
+    // ── Phase 1: single entity pick ───────────────────────────────────────
+
+    fn needs_entity_pick(&self) -> bool {
+        !self.phase1_done()
+    }
+
+    fn on_entity_pick(&mut self, handle: Handle, _pt: Vec3) -> CmdResult {
+        if handle.is_null() {
+            return CmdResult::NeedPoint; // nothing hit, keep waiting
+        }
+        self.src = handle;
+        CmdResult::NeedPoint // move to phase 2 (selection gathering)
+    }
+
+    // ── Phase 2: destination selection gathering ──────────────────────────
+
+    fn is_selection_gathering(&self) -> bool {
+        self.phase1_done()
+    }
+
+    fn on_selection_complete(&mut self, handles: Vec<Handle>) -> CmdResult {
+        if handles.is_empty() {
+            return CmdResult::NeedPoint;
+        }
+        CmdResult::MatchProperties {
+            dest: handles,
+            src: self.src,
+        }
+    }
+
+    fn on_enter(&mut self) -> CmdResult {
+        CmdResult::Cancel
+    }
+
+    fn on_point(&mut self, _pt: Vec3) -> CmdResult {
+        CmdResult::NeedPoint
+    }
+
+    fn on_hover_entity(&mut self, _handle: Handle, _pt: Vec3) -> Vec<WireModel> {
+        vec![]
+    }
+}

src/modules/home/properties/mod.rs

@@ -1 +1 @@
-pub(super) mod match_prop;
+pub mod match_prop;