v1.0.50: add diagnostic logging for the update-refresh flow

No functional change. Adds streamDeck.logger.info() calls at
onPropertyInspectorDidAppear, sendProjectsToPI(), and onSendToPlugin
entry, plus a small on-panel debug trail (property-inspector.html)
that timestamps $PI.onConnected firings, button clicks, poll sends,
and received payloads. v1.0.49's panel-polling fix didn't visibly
work in testing and produced no status text at all on the second
attempt -- need to see the actual event sequence rather than guess
again. Remove once the refresh flow is confirmed working.

com.pdma.notion-timer.sdPlugin/ui/property-inspector.html

@@ -147,6 +147,7 @@
   <p id="versionText"></p>
   <button id="updateBtn">Check for Updates</button>
   <p id="updateStatus"></p>
+  <p id="debugText" style="font-size:9px;color:#555;text-align:center;margin-top:4px;white-space:pre-line;"></p>
 
   <script src="libs/constants.js"></script>
   <script src="libs/prototypes.js"></script>
@@ -176,6 +177,15 @@
       el.className = cls || "";
     }
 
+    // TEMP diagnostic trail — remove once the update-refresh flow is confirmed working.
+    var debugLines = [];
+    function debugLog(msg) {
+      var t = new Date().toISOString().slice(11, 19);
+      debugLines.push(t + " " + msg);
+      if (debugLines.length > 8) debugLines.shift();
+      document.getElementById("debugText").textContent = debugLines.join("\n");
+    }
+
     // The plugin process restarts after an update, and a freshly-restarted
     // process has no way to push to an already-open panel (Stream Deck only
     // tells a plugin a panel is visible via a live didAppear/onSendToPlugin
@@ -186,6 +196,7 @@
       var token = document.getElementById("notionToken").value.trim();
       [1500, 3500, 6000, 9000].forEach(function(delay) {
         setTimeout(function() {
+          debugLog("poll: sending refreshProjects (+" + delay + "ms)");
           $PI.sendToPlugin({ event: "refreshProjects", token: token });
         }, delay);
       });
@@ -269,6 +280,7 @@
     }
 
     $PI.onConnected(function(jsn) {
+      debugLog("$PI.onConnected fired (panel loaded/reloaded)");
       currentSettings = jsn.actionInfo.payload.settings || {};
       $PI.getSettings();
       $PI.getGlobalSettings();
@@ -277,6 +289,7 @@
       document.getElementById("notionToken").addEventListener("input", scheduleCredSave);
       document.getElementById("userId").addEventListener("change", saveCredentials);
       document.getElementById("updateBtn").addEventListener("click", function() {
+        debugLog("Check for Updates clicked");
         document.getElementById("updateStatus").textContent = "";
         $PI.sendToPlugin({ event: "checkForUpdates" });
         pollForVersionRefresh();
@@ -319,6 +332,7 @@
 
     $PI.onSendToPropertyInspector(ACTION_UUID, function(jsn) {
       var payload = jsn.payload;
+      debugLog("received: " + payload.event + (payload.version ? " v" + payload.version : ""));
       if (payload.event === "updateStatus") {
         document.getElementById("updateStatus").textContent = payload.message;
       }