feat: add missing Annotate tab commands and icons

New dimension commands: QDIM, DIMEDIT, DIMTEDIT, DIMBREAK, DIMSPACE,
DIMJOGLINE with full command workflows and SVG icons.

New multileader commands: MLEADERADD, MLEADERREMOVE, MLEADERALIGN,
MLEADERCOLLECT with entity injection pattern for in-place editing.

Updated annotate ribbon: all tools exposed across Text, Dimensions,
Leaders, Tables, Markup, and Annotation Scaling groups. Added STYLE,
FIND, DIMSTYLE shortcut buttons.

Added `inject_picked_entity` to the CadCommand trait for commands that
need a cloned copy of the picked entity to modify (DIMTEDIT, MLEADERADD,
MLEADERREMOVE). Sentinel-based dispatch in cmd_result.rs handles
DIMBREAK, DIMSPACE, DIMJOGLINE, MLEADERALIGN, and MLEADERCOLLECT.

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

src/command/mod.rs

@@ -290,4 +290,9 @@ pub trait CadCommand: Send {
         let _ = obj;
         self.on_point(hit)
     }
+
+    /// Called by update.rs after `on_entity_pick` to inject the cloned entity into commands
+    /// that need to read/modify it (e.g. DIMTEDIT, MLEADERADD, MLEADERREMOVE).
+    /// Default: no-op.
+    fn inject_picked_entity(&mut self, _entity: acadrust::EntityType) {}
 }