Bump to v1.4.0: tap-to-dismiss, docker restart detection, cleanup thread fix

Add /clear-all endpoint and wire it to the tap handler so tapping the
display dismisses active warnings/critical alerts. Fix docker detector
to track restart count deltas instead of relying on the transient
"restarting" state. Wrap cleanup thread in try/except so it can't die
silently and leave events stuck forever.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

index.html

@@ -377,6 +377,11 @@
 					const prevClass = emoteEl.className;
 					const prevMsg = messageEl.textContent;
 
+					// Clear active warning/critical events
+					if (lastData && lastData.active_events && lastData.active_events.length > 0) {
+						fetch("/clear-all", { method: "POST" });
+					}
+
 					// Surprised face!
 					emoteEl.textContent = "( °o°)";
 					emoteEl.className = "popping";