init: add source code from src.zip

src/utils/keyboardShortcuts.ts

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+// Special characters that macOS Option+key produces, mapped to their
+// keybinding equivalents. Used to detect Option+key shortcuts on macOS
+// terminals that don't have "Option as Meta" enabled.
+export const MACOS_OPTION_SPECIAL_CHARS = {
+  '†': 'alt+t', // Option+T -> thinking toggle
+  π: 'alt+p', // Option+P -> model picker
+  ø: 'alt+o', // Option+O -> fast mode
+} as const satisfies Record<string, string>
+
+export function isMacosOptionChar(
+  char: string,
+): char is keyof typeof MACOS_OPTION_SPECIAL_CHARS {
+  return char in MACOS_OPTION_SPECIAL_CHARS
+}