fix(pi-tui): patch 5 resource leak bugs in TUI components

- Loader: clear existing interval in start() to prevent orphaned timers
  on double-call; add dispose() to stop and null TUI ref
- CancellableLoader: abort the AbortController and clear onAbort in
  dispose() so external signal holders release the controller
- Editor: add public dispose() that clears the autocomplete debounce
  timer to prevent post-removal callbacks
- Input: convert focused to getter/setter that resets isInPaste and
  pasteBuffer on focus loss, preventing paste state corruption
- TUI.stop(): iterate overlayStack calling dispose() on each component
  before clearing, stopping overlay timers (e.g. dashboard refresh)

packages/pi-tui/src/components/cancellable-loader.ts

@@ -35,6 +35,8 @@ export class CancellableLoader extends Loader {
 	}
 
 	dispose(): void {
+		this.abortController.abort();
+		this.onAbort = undefined;
 		this.stop();
 	}
 }

packages/pi-tui/src/components/editor.ts

@@ -2055,6 +2055,10 @@ https://github.com/EsotericSoftware/spine-runtimes/actions/runs/19536643416/job/
 		this.lastAutocompleteLookupPrefix = null;
 	}
 
+	public dispose(): void {
+		this.clearAutocompleteDebounce();
+	}
+
 	public isShowingAutocomplete(): boolean {
 		return this.autocompleteState !== null;
 	}

packages/pi-tui/src/components/input.ts

@@ -22,7 +22,17 @@ export class Input implements Component, Focusable {
 	public onEscape?: () => void;
 
 	/** Focusable interface - set by TUI when focus changes */
-	focused: boolean = false;
+	private _focused: boolean = false;
+	get focused(): boolean {
+		return this._focused;
+	}
+	set focused(value: boolean) {
+		this._focused = value;
+		if (!value) {
+			this.isInPaste = false;
+			this.pasteBuffer = "";
+		}
+	}
 
 	// Bracketed paste mode buffering
 	private pasteBuffer: string = "";

packages/pi-tui/src/components/loader.ts

@@ -26,6 +26,9 @@ export class Loader extends Text {
 	}
 
 	start() {
+		if (this.intervalId) {
+			clearInterval(this.intervalId);
+		}
 		this.updateDisplay();
 		this.intervalId = setInterval(() => {
 			this.currentFrame = (this.currentFrame + 1) % this.frames.length;
@@ -40,6 +43,11 @@ export class Loader extends Text {
 		}
 	}
 
+	dispose() {
+		this.stop();
+		this.ui = null;
+	}
+
 	setMessage(message: string) {
 		this.message = message;
 		this.updateDisplay();

packages/pi-tui/src/tui.ts

@@ -441,6 +441,15 @@ export class TUI extends Container {
 
 	stop(): void {
 		this.stopped = true;
+
+		// Dispose all overlays to stop any running timers
+		for (const entry of this.overlayStack) {
+			if ("dispose" in entry.component && typeof (entry.component as any).dispose === "function") {
+				(entry.component as any).dispose();
+			}
+		}
+		this.overlayStack = [];
+
 		// Move cursor to the end of the content to prevent overwriting/artifacts on exit
 		if (this.previousLines.length > 0) {
 			const targetRow = this.previousLines.length; // Line after the last content