chore: flatten src/ to root

ink/events/terminal-focus-event.ts

@@ -0,0 +1,19 @@
+import { Event } from './event.js'
+
+export type TerminalFocusEventType = 'terminalfocus' | 'terminalblur'
+
+/**
+ * Event fired when the terminal window gains or loses focus.
+ *
+ * Uses DECSET 1004 focus reporting - the terminal sends:
+ * - CSI I (\x1b[I) when the terminal gains focus
+ * - CSI O (\x1b[O) when the terminal loses focus
+ */
+export class TerminalFocusEvent extends Event {
+  readonly type: TerminalFocusEventType
+
+  constructor(type: TerminalFocusEventType) {
+    super()
+    this.type = type
+  }
+}