Add chord keyboard shortcuts and staged capture UI

packages/app/src/keyboard/shortcut-string.ts

@@ -103,6 +103,10 @@ export function parseShortcutString(s: string): KeyCombo {
   return combo;
 }
 
+export function parseChordString(s: string): KeyCombo[] {
+  return s.split(" ").map(parseShortcutString);
+}
+
 export function keyComboToString(combo: KeyCombo): string {
   const parts: string[] = [];
 
@@ -122,6 +126,10 @@ export function keyComboToString(combo: KeyCombo): string {
   return parts.join("+");
 }
 
+export function chordToString(chord: KeyCombo[]): string {
+  return chord.map(keyComboToString).join(" ");
+}
+
 const MODIFIER_CODES = new Set([
   "MetaLeft",
   "MetaRight",
@@ -158,6 +166,10 @@ export function comboStringToShortcutKeys(comboString: string): ShortcutKey[] {
   return keys;
 }
 
+export function chordStringToShortcutKeys(s: string): ShortcutKey[][] {
+  return s.split(" ").map(comboStringToShortcutKeys);
+}
+
 export function keyboardEventToComboString(event: KeyboardEvent): string | null {
   if (MODIFIER_CODES.has(event.code)) {
     return null;