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/ui/window/alias_editor.rs

@@ -0,0 +1,157 @@
+//! Command-alias editor — an in-canvas modal (Plan B) for adding, remapping and
+//! removing command-line aliases (the `ocad.pgp` table). Opened by ALIASEDIT.
+//! Rows are `(alias, command)`; edits are buffered in `alias_editor_rows` and
+//! committed to the alias table when the dialog closes. Mirrors the editable-row
+//! pattern of the attribute editor and plugin manager.
+
+use crate::app::Message;
+use iced::widget::{button, column, container, row, scrollable, text, text_input, Space};
+use iced::{Background, Border, Color, Element, Fill, Length, Theme};
+
+/// Which column of an alias row a text edit targets.
+#[derive(Clone, Copy, Debug)]
+pub enum AliasField {
+    Alias,
+    Command,
+}
+
+/// Right-hand lane reserved for the scrollbar so it never overlaps the ✕ column.
+const GUTTER: f32 = 16.0;
+
+const BG: Color = Color { r: 0.15, g: 0.15, b: 0.15, a: 1.0 };
+const FIELD_BG: Color = Color { r: 0.12, g: 0.12, b: 0.12, a: 1.0 };
+const BORDER: Color = Color { r: 0.35, g: 0.35, b: 0.35, a: 1.0 };
+const DIM: Color = Color { r: 0.55, g: 0.55, b: 0.55, a: 1.0 };
+const WHITE: Color = Color { r: 0.85, g: 0.85, b: 0.85, a: 1.0 };
+const ADD_C: Color = Color { r: 0.20, g: 0.40, b: 0.62, a: 1.0 };
+
+fn field_style(_: &Theme, _s: text_input::Status) -> text_input::Style {
+    text_input::Style {
+        background: Background::Color(FIELD_BG),
+        border: Border { color: BORDER, width: 1.0, radius: 3.0.into() },
+        icon: WHITE,
+        placeholder: DIM,
+        value: WHITE,
+        selection: Color { r: 0.25, g: 0.40, b: 0.60, a: 1.0 },
+    }
+}
+
+/// Build the alias editor content. `rows` is the live working buffer.
+pub fn view_window(rows: &[(String, String)]) -> Element<'_, Message> {
+    let title = text("Command Aliases").size(15).color(WHITE);
+    let hint = text(
+        "Type an alias and the command it runs (e.g. L → LINE). \
+         Apply to save to ocad.pgp; closing discards unapplied edits.",
+    )
+    .size(11)
+    .color(DIM);
+
+    // Right gutter reserved so the scrollbar has its own lane and never sits on
+    // top of the row delete (✕) buttons. Applied to both the header and the
+    // scrollable rows so the columns stay aligned.
+    let gutter = iced::Padding { top: 0.0, right: GUTTER, bottom: 0.0, left: 0.0 };
+
+    let head = container(
+        row![
+            container(text("Alias").size(11).color(DIM)).width(Length::Fixed(120.0)),
+            container(text("Command").size(11).color(DIM)).width(Fill),
+            Space::new().width(Length::Fixed(30.0)),
+        ]
+        .spacing(8),
+    )
+    .padding(gutter);
+
+    let mut list = column![].spacing(3);
+    for (idx, (alias, cmd)) in rows.iter().enumerate() {
+        let alias_box = text_input("alias", alias)
+            .on_input(move |v| Message::AliasEditorInput { idx, field: AliasField::Alias, value: v })
+            .style(field_style)
+            .size(13)
+            .padding([3, 6])
+            .width(Length::Fixed(120.0));
+        let cmd_box = text_input("command", cmd)
+            .on_input(move |v| Message::AliasEditorInput { idx, field: AliasField::Command, value: v })
+            .style(field_style)
+            .size(13)
+            .padding([3, 6])
+            .width(Fill);
+        let del = button(crate::ui::icons::tinted(crate::ui::icons::CLOSE, 12.0, WHITE))
+            .on_press(Message::AliasEditorRemove(idx))
+            .padding([2, 6])
+            .style(|_: &Theme, status| {
+                let bg = if matches!(status, button::Status::Hovered) {
+                    Color { r: 0.45, g: 0.22, b: 0.22, a: 1.0 }
+                } else {
+                    Color { r: 0.22, g: 0.22, b: 0.22, a: 1.0 }
+                };
+                button::Style {
+                    background: Some(Background::Color(bg)),
+                    border: Border { color: BORDER, width: 1.0, radius: 3.0.into() },
+                    ..Default::default()
+                }
+            });
+        list = list.push(
+            row![alias_box, cmd_box, del]
+                .spacing(8)
+                .align_y(iced::Center),
+        );
+    }
+
+    let add = button(text("+ Add alias").size(12).color(WHITE))
+        .on_press(Message::AliasEditorAdd)
+        .padding([4, 10])
+        .style(|_: &Theme, status| {
+            let bg = if matches!(status, button::Status::Hovered) {
+                Color { r: 0.30, g: 0.30, b: 0.30, a: 1.0 }
+            } else {
+                Color { r: 0.22, g: 0.22, b: 0.22, a: 1.0 }
+            };
+            button::Style {
+                background: Some(Background::Color(bg)),
+                text_color: WHITE,
+                border: Border { color: BORDER, width: 1.0, radius: 3.0.into() },
+                ..Default::default()
+            }
+        });
+
+    // Apply — primary action; commits the rows to ocad.pgp and stays open.
+    let apply = button(text("Apply").size(12).color(WHITE))
+        .on_press(Message::AliasEditorApply)
+        .padding([4, 16])
+        .style(|_: &Theme, status| {
+            let bg = if matches!(status, button::Status::Hovered | button::Status::Pressed) {
+                Color { r: 0.24, g: 0.46, b: 0.74, a: 1.0 }
+            } else {
+                ADD_C
+            };
+            button::Style {
+                background: Some(Background::Color(bg)),
+                text_color: WHITE,
+                border: Border { radius: 4.0.into(), ..Default::default() },
+                ..Default::default()
+            }
+        });
+
+    container(
+        column![
+            title,
+            hint,
+            Space::new().height(6),
+            head,
+            scrollable(container(list).padding(gutter)).height(Fill),
+            Space::new().height(6),
+            row![add, Space::new().width(Fill), apply].align_y(iced::Center),
+        ]
+        .spacing(6)
+        .width(Fill)
+        .height(Fill),
+    )
+    .padding(12)
+    .width(Fill)
+    .height(Fill)
+    .style(|_: &Theme| container::Style {
+        background: Some(Background::Color(BG)),
+        ..Default::default()
+    })
+    .into()
+}