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/display.rs

@@ -5,7 +5,7 @@ impl OpenCADStudio {
         match cmd {
             // Interactive pan: left-drag pans the view until Esc. The only pan
             // path when there is no middle mouse button (trackpad / web).
-            "PAN" | "P" => {
+            "PAN" => {
                 self.tabs[i].pan_mode = true;
                 self.command_line
                     .push_output("PAN: drag with the left mouse button. Press Esc to exit.");
@@ -126,7 +126,7 @@ impl OpenCADStudio {
             }
 
             // ── PROPERTIES — toggle Properties panel visibility ──────────────────
-            "PROPERTIES" | "PR" | "PROPS" => {
+            "PROPERTIES" | "PROPS" => {
                 return Some(Task::done(Message::ToggleProperties));
             }
 
@@ -160,7 +160,7 @@ impl OpenCADStudio {
                 return Some(Task::done(Message::ToggleSnapPopup));
             }
             // UNITS — open the drawing-units picker (linear / angular format).
-            "UNITS" | "UN" | "DDUNITS" => {
+            "UNITS" | "DDUNITS" => {
                 return Some(Task::done(Message::ToggleUnitsPopup));
             }
 
@@ -174,13 +174,13 @@ impl OpenCADStudio {
             }
 
             // ── TOOLPALETTES — not yet implemented ───────────────────────────────
-            "TOOLPALETTES" | "TP" => {
+            "TOOLPALETTES" => {
                 self.command_line
                     .push_info("TOOLPALETTES: Tool Palettes not yet implemented.");
             }
 
             // ── SHEETSET — not yet implemented ───────────────────────────────────
-            "SHEETSET" | "SSM" => {
+            "SHEETSET" => {
                 self.command_line
                     .push_info("SHEETSET: Sheet Set Manager not yet implemented.");
             }
@@ -292,7 +292,7 @@ impl OpenCADStudio {
             // PRESSPULL on a closed boundary creates a solid by extruding it to a
             // height — the same operation as EXTRUDE. THICKEN turns a closed planar
             // profile into a solid of the given thickness, which is also an extrude.
-            "EXTRUDE" | "EXT" | "PRESSPULL" | "THICKEN" => {
+            "EXTRUDE" | "PRESSPULL" | "THICKEN" => {
                 use crate::modules::insert::solid3d_cmds::ExtrudeCommand;
                 // If a single entity is already selected, skip the pick step.
                 let selected: Vec<_> = self.tabs[i].scene.selected_entities().into_iter().collect();
@@ -311,7 +311,7 @@ impl OpenCADStudio {
             }
 
             // ── REVOLVE ────────────────────────────────────────────────────
-            "REVOLVE" | "REV" => {
+            "REVOLVE" => {
                 use crate::modules::insert::solid3d_cmds::RevolveCommand;
                 let color = self.tabs[i].scene.layer_color(&self.tabs[i].active_layer);
                 let cmd = RevolveCommand::new(color);