Enforce Rust coding standards via Clippy (#2239)

* chore(clippy): enforce workspace Rust quality gates

* refactor(doc): use explicit entity imports

* refactor(constraints): split residual evaluation

* refactor(fonts): split mtext layout

* refactor(render): use explicit entity imports

* fix(fonts): retain height for empty paragraphs

* fix(doc): repair dimension and dynamic block links

* refactor(render): split entity drawing helpers

* docs: document workspace lint inheritance

* refactor(render): isolate dimension geometry

* refactor(engine): use explicit imports

* refactor(engine): split complex edit paths into helpers

* refactor(io): split DXF read and write helpers

* refactor(ui): split canvas interaction and drawing

* refactor(ui): split command and drawing helpers

* test(i18n): split locale preference checks

* fix(ui): use current egui scope id API

* fix(dim): preserve text offset and ellipse grip behavior

crates/engine/src/cmd/modify/explode.rs

@@ -1,4 +1,4 @@
-use super::*;
+use super::{Entity, EntityKind, Handle, PolyVertex, Polyline, Result, Segment, Session, Value, Vec2, arc, json, line, lwpoly, targets, v3};
 
 // ---------------- explode / array / order / break / join ----------------