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>

assets/ocad.pgp

@@ -0,0 +1,124 @@
+; OpenCADStudio command aliases.
+; Format:  ALIAS,*COMMAND   (lines starting with ';' are comments)
+; Edit here or via the ALIASEDIT command. One alias per line.
+;
+; This file is the single source of truth for command-line aliases. It is
+; copied to your user config folder on first launch; edit that copy (or use
+; ALIASEDIT) to add, remap, or remove aliases.
+
+; ── Draw ──────────────────────────────────────────────────────────────────
+L,        *LINE
+ML,       *MLINE
+PL,       *PLINE
+A,        *ARC
+C,        *CIRCLE
+DO,       *DONUT
+EL,       *ELLIPSE
+PO,       *POINT
+SPL,      *SPLINE
+H,        *HATCH
+HE,       *HATCHEDIT
+XL,       *XLINE
+POL,      *POLYGON
+REC,      *RECT
+SO,       *SOLID
+WO,       *WIPEOUT
+
+; ── Modify ────────────────────────────────────────────────────────────────
+M,        *MOVE
+CO,       *COPY
+RO,       *ROTATE
+SC,       *SCALE
+MI,       *MIRROR
+E,        *ERASE
+X,        *EXPLODE
+SS,       *STRETCH
+O,        *OFFSET
+TR,       *TRIM
+EX,       *EXTEND
+F,        *FILLET
+CHA,      *CHAMFER
+J,        *JOIN
+BR,       *BREAK
+BAP,      *BREAKATPOINT
+PE,       *PEDIT
+SPE,      *SPLINEDIT
+LEN,      *LENGTHEN
+AL,       *ALIGN
+AR,       *ARRAY
+MA,       *MATCHPROP
+ATE,      *ATTEDIT
+
+; ── Clipboard ─────────────────────────────────────────────────────────────
+CC,       *COPYCLIP
+CX,       *CUTCLIP
+PC,       *PASTECLIP
+
+; ── Blocks / references ───────────────────────────────────────────────────
+XA,       *XATTACH
+XR,       *XREF
+ADC,      *ADCENTER
+
+; ── Layers / groups ───────────────────────────────────────────────────────
+LA,       *LAYERS
+G,        *GROUP
+UG,       *UNGROUP
+
+; ── Dimensions / annotation ───────────────────────────────────────────────
+DAL,      *DIMALIGNED
+DAN,      *DIMANGULAR
+DDI,      *DIMDIAMETER
+DLI,      *DIMLINEAR
+DRA,      *DIMRADIUS
+DOR,      *DIMORDINATE
+DBA,      *DIMBASELINE
+DCO,      *DIMCONTINUE
+DED,      *DIMEDIT
+DBR,      *DIMBREAK
+DJL,      *DIMJOGLINE
+DJO,      *DIMJOGGED
+DCE,      *DIMCENTER
+LE,       *LEADER
+QL,       *QLEADER
+MLD,      *MLEADER
+MLA,      *MLEADERADD
+MLR,      *MLEADERREMOVE
+MLAL,     *MLEADERALIGN
+MLC,      *MLEADERCOLLECT
+MT,       *MTEXT
+DT,       *TEXT
+T,        *TEXT
+ED,       *DDEDIT
+TOL,      *TOLERANCE
+
+; ── Inquiry / selection ───────────────────────────────────────────────────
+AA,       *AREA
+DI,       *DIST
+DIV,      *DIVIDE
+ME,       *MEASURE
+MEA,      *MEASUREGEOM
+LI,       *LIST
+SA,       *SELECTALL
+DE,       *DESELECT
+QS,       *QSELECT
+FI,       *FILTER
+
+; ── View / display ────────────────────────────────────────────────────────
+P,        *PAN
+U,        *UNDO
+PR,       *PROPERTIES
+UN,       *UNITS
+TP,       *TOOLPALETTES
+SSM,      *SHEETSET
+VW,       *WIREFRAME
+HI,       *HIDE
+3O,       *3DORBIT
+MV,       *MVIEW
+MS,       *MSPACE
+PW,       *PLOTWINDOW
+QP,       *QUICKPRINT
+
+; ── 3D solids ─────────────────────────────────────────────────────────────
+EXT,      *EXTRUDE
+REV,      *REVOLVE
+INF,      *INTERFERE