ui: Little adjustments

ui/app-window.slint

@@ -17,7 +17,8 @@ export component AppWindow inherits Window {
     preferred-width: 800px;
     preferred-height: 600px;
     max-width: 2147483647px;
-
+    max-height: 2147483647px;
+    
     callback start-new-event <=> record.start-new-event;
     callback stop-event <=> record.stop-event;
     callback chain-event <=> record.chain-event;
@@ -63,6 +64,7 @@ export component AppWindow inherits Window {
         height: 100%;
         tl := Timeline {
             preferred-height: 100%;
+            min-height: 50px;
             state: in-record-mode ? record-state : review-state;
             clicked => {
                 minimized = !minimized;

ui/record.slint

@@ -35,6 +35,7 @@ export component RecordWidget inherits VerticalLayout {
             text: in-progress ? "Stop" : "Start";
             row: 1;
             colspan: 2;
+            primary: true;
             clicked => {
                 if in-progress {
                     root.stop-event();

ui/review.slint

@@ -33,6 +33,7 @@ export component ReviewWidget inherits VerticalLayout {
                 horizontal-alignment: right;
             }
             Button {
+                primary: true;
                 text: "Select";
                 clicked => {
                     date-picker.show()