Give the activity row a name Slint will accept

`ActivityItem inherits VerticalLayout` declared `in property <ActivityRow>
row`, and every element that can sit in a GridLayout already carries a `row`
for its grid placement — so the declaration was an override of a built-in
rather than a new property, and the compiler refused it. dr-ui had not built
since.

Renamed to `job`, which is also the better word: the property is one
background job, and `row` described where it was drawn rather than what it
holds.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

ui/dr-ui/ui/settings.slint

@@ -247,7 +247,7 @@ component EntryRow inherits VerticalLayout {
 // 1 (it finished, and a full bar is noise) or frozen part-way (it failed, and
 // a bar sitting at 60% invites the reading "still going").
 component ActivityItem inherits VerticalLayout {
-    in property <ActivityRow> row;
+    in property <ActivityRow> job;
 
     spacing: 4px;
 
@@ -255,29 +255,29 @@ component ActivityItem inherits VerticalLayout {
         spacing: Theme.gap;
 
         Label {
-            text: root.row.title;
+            text: root.job.title;
             body: true;
             // Faded once it is over: the list is ordered running-first, and
             // this is what makes that ordering visible at a glance rather than
             // something the reader has to work out from the text.
-            opacity: root.row.running ? 1.0 : 0.6;
+            opacity: root.job.running ? 1.0 : 0.6;
         }
 
         Caption {
-            text: root.row.detail;
+            text: root.job.detail;
             // A failure is the one thing here worth a colour (NFR-A11Y-3 is
             // satisfied by the words, which say what failed; the hue only
             // finds them faster).
-            warn: root.row.failed;
+            warn: root.job.failed;
             horizontal-alignment: right;
             horizontal-stretch: 1;
             overflow: elide;
         }
     }
 
-    if root.row.running: ProgressBar {
-        indeterminate: !root.row.determinate;
-        fraction: root.row.fraction;
+    if root.job.running: ProgressBar {
+        indeterminate: !root.job.determinate;
+        fraction: root.job.fraction;
     }
 }
 
@@ -486,7 +486,7 @@ export component SettingsPage inherits Rectangle {
                         }
 
                         for row in root.activity-rows: ActivityItem {
-                            row: row;
+                            job: row;
                         }
 
                         if root.activity-kept > 0: Rectangle {