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 <noreply@anthropic.com>
