crash reporter: expected absence is silent, a real read failure is not

surfaces/quickshell/services/CrashReporter.qml

@@ -76,14 +76,39 @@ Singleton {
         }
     }
 
+    // Set once we have successfully read the log, so a later failure is
+    // distinguishable from "it has never existed".
+    property bool _crashLogSeen: false
+    property bool _crashLogFailureReported: false
+
     FileView {
         id: crashLog
         path: root.stateDir + "/crashes.log"
         watchChanges: true
-        onFileChanged: reload()
-        onLoaded: root.consumeCrashLog()
         // No crashes.log yet — nothing has ever crashed. The watcher can't
-        // watch a nonexistent file, so the 30s tick retries the reload.
+        // watch a nonexistent file, so the 30s tick retries the reload, and
+        // each retry printed a "Read of ... failed" warning. On a healthy
+        // 16h session that was 1293 lines — 78% of everything in the shell
+        // log, drowning the file we read to verify our own changes.
+        //
+        // Absence is the *expected* state here, so it is silenced. But it is
+        // not silenced blind: onLoadFailed still fires, and a failure after
+        // we have once read the file successfully is a real fault and says
+        // so — once, not every 30 seconds.
+        printErrors: false
+        onFileChanged: reload()
+        onLoaded: {
+            root._crashLogSeen = true;
+            root._crashLogFailureReported = false;
+            root.consumeCrashLog();
+        }
+        onLoadFailed: {
+            if (root._crashLogSeen && !root._crashLogFailureReported) {
+                root._crashLogFailureReported = true;
+                console.log("[CrashReporter] crashes.log became unreadable at",
+                            crashLog.path, "— crash reporting is blind until it returns");
+            }
+        }
     }
 
     function consumeCrashLog() {