feat(alias): centralize command aliases in user-editable ocad.pgp (#286/#288)

Command aliases (L→LINE, CC→COPYCLIP) were scattered across dispatch match
arms and CommandRegistration name arrays. Move them all into a single
user-editable file:

- assets/ocad.pgp: shipped default alias table (ALIAS,*COMMAND format),
  embedded and copied to config/ocad.pgp on first launch; only that user
  copy is read after. AA→AREA default closes #286.
- resolve_alias() rewrites the leading command token at the top of
  dispatch_command_inner, so aliases resolve for every path (families,
  plugins, Repeat menu). Args after the first space are untouched.
- Autocomplete hides alias keys and, when the whole input is an alias,
  surfaces its target command as the top (highlighted) suggestion so the
  highlight matches what Enter runs (AA→AREA, L→LINE).
- ALIASEDIT opens a new editor modal (add/edit/delete rows) with an Apply
  button; Apply persists to ocad.pgp, closing discards unapplied edits.
- Strip alias tokens from all 8 dispatch match-arm files and 71 module
  CommandRegistration arrays, keeping canonical/synonym/distinct-command
  names. ocad.pgp is now the sole source: deleting or remapping an alias
  there takes effect. CUI stays on the keyboard-shortcut panel.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/update/mod.rs

@@ -118,6 +118,12 @@ impl OpenCADStudio {
                 self.attr_editor_selected = 0;
                 self.attr_editor_tab = crate::ui::window::attribute_editor::AttrTab::Attribute;
             }
+            // Closing (✕) discards edits made since the last Apply — matching the
+            // style editors. Committing happens only through the Apply button.
+            Some(Aliases) => {
+                self.alias_editor_rows.clear();
+                self.ribbon.deactivate_tool_if("ALIASEDIT");
+            }
             _ => {}
         }
         self.active_modal = None;
@@ -2631,6 +2637,52 @@ impl OpenCADStudio {
                 Task::none()
             }
 
+            // ── Command Alias Editor (ALIASEDIT) ──────────────────────────────
+            Message::AliasEditorOpen => {
+                // Seed the working buffer from the current table, sorted by alias
+                // so the list is stable and diffable.
+                let mut rows: Vec<(String, String)> = self
+                    .command_aliases
+                    .iter()
+                    .map(|(a, c)| (a.clone(), c.clone()))
+                    .collect();
+                rows.sort_by(|a, b| a.0.cmp(&b.0));
+                self.alias_editor_rows = rows;
+                self.active_modal = Some(super::ModalKind::Aliases);
+                Task::none()
+            }
+            Message::AliasEditorInput { idx, field, value } => {
+                use crate::ui::window::alias_editor::AliasField;
+                // Aliases and commands are stored uppercase; uppercasing as the
+                // user types keeps display and the committed table consistent.
+                let value = value.to_uppercase();
+                if let Some(rowdata) = self.alias_editor_rows.get_mut(idx) {
+                    match field {
+                        AliasField::Alias => rowdata.0 = value,
+                        AliasField::Command => rowdata.1 = value,
+                    }
+                }
+                Task::none()
+            }
+            Message::AliasEditorAdd => {
+                self.alias_editor_rows.push((String::new(), String::new()));
+                Task::none()
+            }
+            Message::AliasEditorRemove(idx) => {
+                if idx < self.alias_editor_rows.len() {
+                    self.alias_editor_rows.remove(idx);
+                }
+                Task::none()
+            }
+            Message::AliasEditorApply => {
+                self.apply_alias_editor_rows();
+                self.command_line.push_info(&format!(
+                    "{} alias(es) applied.",
+                    self.command_aliases.len()
+                ));
+                Task::none()
+            }
+
             // ── About window ──────────────────────────────────────────────
             Message::AboutOpen => {
                 self.active_modal = Some(super::ModalKind::About);