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/table_cmd.rs

@@ -0,0 +1,139 @@
+// TABLE command — create an empty table entity.
+//
+// Workflow:
+//   1. Text: Enter number of columns  (default 3)
+//   2. Text: Enter number of rows     (default 4, includes header row)
+//   3. Point: Click insertion point
+//
+// Creates a Table entity with uniform row height (0.5) and column width (2.0).
+
+use acadrust::entities::TableBuilder;
+use acadrust::types::Vector3;
+use acadrust::EntityType;
+use glam::Vec3;
+
+use crate::command::{CadCommand, CmdResult};
+use crate::scene::wire_model::WireModel;
+
+const DEFAULT_COLS: usize = 3;
+const DEFAULT_ROWS: usize = 4;
+const COL_WIDTH: f64 = 2.0;
+const ROW_HEIGHT: f64 = 0.5;
+
+enum Step {
+    Columns,
+    Rows { cols: usize },
+    Insertion { cols: usize, rows: usize },
+}
+
+pub struct TableCommand {
+    step: Step,
+}
+
+impl TableCommand {
+    pub fn new() -> Self {
+        Self { step: Step::Columns }
+    }
+}
+
+impl CadCommand for TableCommand {
+    fn name(&self) -> &'static str { "TABLE" }
+
+    fn prompt(&self) -> String {
+        match &self.step {
+            Step::Columns => format!("TABLE  Enter number of columns [{DEFAULT_COLS}]:"),
+            Step::Rows { cols } => format!("TABLE  Enter number of rows (incl. header) [{DEFAULT_ROWS}]  ({cols} cols):"),
+            Step::Insertion { cols, rows } => format!("TABLE  Specify insertion point  [{cols}×{rows}]:"),
+        }
+    }
+
+    fn wants_text_input(&self) -> bool {
+        !matches!(self.step, Step::Insertion { .. })
+    }
+
+    fn on_text_input(&mut self, text: &str) -> Option<CmdResult> {
+        let t = text.trim();
+        match &self.step {
+            Step::Columns => {
+                let cols = if t.is_empty() {
+                    DEFAULT_COLS
+                } else {
+                    t.parse::<usize>().ok().filter(|&n| n >= 1)?
+                };
+                self.step = Step::Rows { cols };
+                Some(CmdResult::NeedPoint)
+            }
+            Step::Rows { cols } => {
+                let cols = *cols;
+                let rows = if t.is_empty() {
+                    DEFAULT_ROWS
+                } else {
+                    t.parse::<usize>().ok().filter(|&n| n >= 1)?
+                };
+                self.step = Step::Insertion { cols, rows };
+                Some(CmdResult::NeedPoint)
+            }
+            Step::Insertion { .. } => None,
+        }
+    }
+
+    fn on_enter(&mut self) -> CmdResult {
+        match &self.step {
+            Step::Columns => {
+                // Accept default.
+                self.step = Step::Rows { cols: DEFAULT_COLS };
+                CmdResult::NeedPoint
+            }
+            Step::Rows { cols } => {
+                let cols = *cols;
+                self.step = Step::Insertion { cols, rows: DEFAULT_ROWS };
+                CmdResult::NeedPoint
+            }
+            Step::Insertion { .. } => CmdResult::Cancel,
+        }
+    }
+
+    fn on_point(&mut self, pt: Vec3) -> CmdResult {
+        if let Step::Insertion { cols, rows } = self.step {
+            let ins = Vector3::new(pt.x as f64, pt.z as f64, pt.y as f64);
+            let table = TableBuilder::new(rows, cols)
+                .at(ins)
+                .row_height(ROW_HEIGHT)
+                .column_width(COL_WIDTH)
+                .build();
+            CmdResult::CommitAndExit(EntityType::Table(table))
+        } else {
+            CmdResult::NeedPoint
+        }
+    }
+
+    fn on_mouse_move(&mut self, pt: Vec3) -> Option<WireModel> {
+        if let Step::Insertion { cols, rows } = self.step {
+            // Preview: outline of the table bounding box.
+            let w = (cols as f32) * COL_WIDTH as f32;
+            let h = (rows as f32) * ROW_HEIGHT as f32;
+            let x = pt.x;
+            let y = pt.y;
+            let z = pt.z;
+            Some(WireModel {
+                name: "table_preview".into(),
+                points: vec![
+                    [x, y, z], [x + w, y, z],
+                    [x + w, y, z], [x + w, y, z - h],
+                    [x + w, y, z - h], [x, y, z - h],
+                    [x, y, z - h], [x, y, z],
+                ],
+                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![],
+            })
+        } else {
+            None
+        }
+    }
+}