Feat: ROADMAP Phase 1-5 batch — trim/extend, plot scale, viewport UX, mline caps, table alignment

- TRIM/EXTEND: Ray and XLine entities supported as cutting boundaries and trim targets;
  trim results in Ray→Line/Ray, XLine→Ray/Ray or Line; hover preview added
- Plot scale override: Fit/1:1/1:2/1:5/1:10/1:20/1:50/1:100/2:1 buttons added to Page Setup
  panel; PageSetupCommit applies scale to PlotSettings
- Viewport UX: locked viewport gets orange border; selected viewport gets white border
- Named view → viewport assignment: Choice dropdown in properties panel copies
  view_target/direction/height to the viewport entity
- MLine caps: perpendicular start/end cap lines added for open (non-closed) MLines
- Wipeout polygon grips: boundary vertices become editable grips when clipping_enabled+Polygonal;
  world→pixel back-projection on drag
- Table cell alignment: CellStyle.alignment (1-9) drives left/center/right + top/middle/bottom
  text positioning; cxf::measure_text() helper added
- New commands/features: DIMCONTINUE (DCO), DIMBASELINE (DBA), TOLERANCE (TOL), TABLE,
  ATTDEF, ATTEDIT, ATTDISP, BREAKATPOINT (BAP), PLOTWINDOW (PW), MLINE (ML);
  DIMSTYLE/DIMCURRENT/CLAYER/LTSCALE/CELTSCALE/SCALETEXT/XDATA/UCSICON/REGEN/DRAWORDER extended
- PLINE arc mode: A/L/CLOSE text input, bulge computation, arc preview
- Warning cleanup: removed unused imports and unreachable patterns

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

src/modules/annotate/tolerance_cmd.rs

@@ -0,0 +1,89 @@
+// TOLERANCE command — place a GD&T (geometric dimensioning & tolerancing) frame.
+//
+// Workflow:
+//   1. Text: Enter tolerance string  (e.g. "%%v0.05|A" or plain text)
+//   2. Point: Click insertion point
+
+use acadrust::entities::Tolerance;
+use acadrust::types::Vector3;
+use acadrust::EntityType;
+use glam::Vec3;
+
+use crate::command::{CadCommand, CmdResult};
+use crate::scene::wire_model::WireModel;
+
+enum Step {
+    Text,
+    Insertion { text: String },
+}
+
+pub struct ToleranceCommand {
+    step: Step,
+}
+
+impl ToleranceCommand {
+    pub fn new() -> Self {
+        Self { step: Step::Text }
+    }
+}
+
+impl CadCommand for ToleranceCommand {
+    fn name(&self) -> &'static str { "TOLERANCE" }
+
+    fn prompt(&self) -> String {
+        match &self.step {
+            Step::Text => "TOLERANCE  Enter tolerance text:".into(),
+            Step::Insertion { text } => format!("TOLERANCE  Specify insertion point  [{text}]:"),
+        }
+    }
+
+    fn wants_text_input(&self) -> bool {
+        matches!(self.step, Step::Text)
+    }
+
+    fn on_text_input(&mut self, text: &str) -> Option<CmdResult> {
+        let t = text.trim().to_string();
+        if t.is_empty() {
+            return Some(CmdResult::Cancel);
+        }
+        self.step = Step::Insertion { text: t };
+        Some(CmdResult::NeedPoint)
+    }
+
+    fn on_point(&mut self, pt: Vec3) -> CmdResult {
+        if let Step::Insertion { text } = &self.step {
+            let ins = Vector3::new(pt.x as f64, pt.z as f64, pt.y as f64);
+            let tol = Tolerance::with_text(ins, text.clone());
+            CmdResult::CommitAndExit(EntityType::Tolerance(tol))
+        } else {
+            CmdResult::NeedPoint
+        }
+    }
+
+    fn on_enter(&mut self) -> CmdResult {
+        CmdResult::Cancel
+    }
+
+    fn on_mouse_move(&mut self, pt: Vec3) -> Option<WireModel> {
+        if !matches!(self.step, Step::Insertion { .. }) {
+            return None;
+        }
+        let d = 0.15_f32;
+        Some(WireModel {
+            name: "tolerance_preview".into(),
+            points: vec![
+                [pt.x - d, pt.y, pt.z], [pt.x + d, pt.y, pt.z],
+                [f32::NAN, 0.0, 0.0],
+                [pt.x, pt.y, pt.z - d], [pt.x, pt.y, pt.z + d],
+            ],
+            color: WireModel::CYAN,
+            selected: false,
+            pattern_length: 0.0,
+            pattern: [0.0; 8],
+            line_weight_px: 1.0,
+            snap_pts: vec![],
+            tangent_geoms: vec![],
+            key_vertices: vec![],
+        })
+    }
+}