fix(useDebounce, useThrottle): resolve instead of reject on cancel

Calling cancel() previously rejected the pending promise with
"Cancelled", which caused uncaught promise errors when callers
didn't attach a .catch() handler. Since cancellation is an expected
control flow, resolve with undefined instead.

Also applies the same fix to useThrottle which had the identical issue.

Closes #365

Author: bxff

packages/runed/src/lib/utilities/use-debounce/use-debounce.svelte.ts

@@ -94,7 +94,7 @@ export function useDebounce<Args extends unknown[], Return>(
 		}
 
 		clearTimeout(context.timeout);
-		context.reject("Cancelled");
+		context.resolve(undefined as unknown as Return);
 		context = null;
 	};
 

packages/runed/src/lib/utilities/use-debounce/use-debounce.test.svelte.ts

@@ -20,7 +20,7 @@ describe("useDebounce", () => {
 		const debounced = useDebounce(fn, 100);
 
 		expect(fn).not.toHaveBeenCalled();
-		debounced().catch(() => {});
+		debounced();
 		expect(fn).not.toHaveBeenCalled();
 		expect(debounced.pending).toBe(true);
 		debounced.cancel();
@@ -35,7 +35,7 @@ describe("useDebounce", () => {
 		const debounced = useDebounce(fn, 100);
 
 		expect(fn).not.toHaveBeenCalled();
-		debounced().catch(() => {});
+		debounced();
 		expect(fn).not.toHaveBeenCalled();
 		expect(debounced.pending).toBe(true);
 		debounced.cancel();
@@ -44,11 +44,11 @@ describe("useDebounce", () => {
 		expect(fn).not.toHaveBeenCalled();
 
 		// New test
-		let wasCatchCalled = false;
-		debounced().catch(() => (wasCatchCalled = true));
-		expect(wasCatchCalled).toBe(false);
+		let wasResolved = false;
+		debounced().then(() => (wasResolved = true));
+		expect(wasResolved).toBe(false);
 		await new Promise((resolve) => setTimeout(resolve, 110));
-		expect(wasCatchCalled).toBe(false);
+		expect(wasResolved).toBe(true);
 		expect(fn).toHaveBeenCalledTimes(1);
 	});
 

packages/runed/src/lib/utilities/use-throttle/use-throttle.svelte.ts

@@ -85,7 +85,7 @@ export function useThrottle<Args extends unknown[], Return>(
 			}
 
 			clearTimeout(timeout);
-			reject?.("Cancelled");
+			resolve?.(undefined as unknown as Return);
 			reset();
 		}
 	};