fix: defer contenteditable blur linkification to unblock mobile tap events

When a contenteditable loses focus, the onblur handler immediately modified
innerHTML to linkify URLs. On mobile, this DOM mutation causes a layout reflow
between touchstart and click, making the browser cancel taps on the adjacent
delete button. Deferring via requestAnimationFrame ensures the click event
fires before the DOM is modified.

https://claude.ai/code/session_01VZceWPhHMHCA6SELBdCPfN

src/lib/components/Checklist.svelte

@@ -324,7 +324,14 @@
 					onkeydown={(e) => handleKeydown(e, item.id)}
 					onclick={handleLinkClick}
 					onpaste={handlePaste}
-					onblur={(e) => { (e.target as HTMLElement).innerHTML = linkifyText(item.text); }}
+					onblur={(e) => {
+						const el = e.target as HTMLElement;
+						requestAnimationFrame(() => {
+							if (el.isConnected && document.activeElement !== el) {
+								el.innerHTML = linkifyText(item.text);
+							}
+						});
+					}}
 					class="flex-1 min-w-0 bg-transparent text-sm outline-none break-words {item.checked ? 'text-[var(--text-muted)] line-through' : 'text-[var(--text)]'}"
 					data-placeholder="List item"
 					aria-placeholder="List item"