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/commands/mod.rs

@@ -59,6 +59,12 @@ impl OpenCADStudio {
 
     fn dispatch_command_inner(&mut self, cmd: &str, allow_suggest: bool) -> Task<Message> {
         let i = self.active_tab;
+        // Expand a command alias ("L" → "LINE") on the leading token before any
+        // routing, so every path below (Start-tab gate, plugins, all dispatch
+        // families, the Repeat menu) sees the canonical command. Arguments after
+        // the first space are left untouched. A non-alias passes through as-is.
+        let resolved = self.resolve_alias(cmd);
+        let cmd = resolved.as_deref().unwrap_or(cmd);
         // Starting a command closes any open ribbon dropdown (e.g. a style
         // combo left open) so it does not stay stuck behind the new tool.
         self.ribbon.close_dropdown();
@@ -151,6 +157,7 @@ impl OpenCADStudio {
             if let Some(top) = crate::ui::command_line::ranked_matches(
                 cmd,
                 &self.command_line.dynamic_commands,
+                &self.command_line.command_aliases,
             )
             .into_iter()
             .next()