Fix UI theme padding and clipping issues

- Increase min-height and padding on QDockWidget::title to prevent header text clipping
- Increase min-height and padding on QSint--ActionGroup QToolButton for task panel headers
- Add specific styling for spreadsheet cell editor with reduced padding for better text visibility

src/Gui/Stylesheets/KindredCreate.qss

@@ -247,8 +247,9 @@ QDockWidget {
 QDockWidget::title {
     background-color: #181825;
     color: #cdd6f4;
-    padding: 6px;
+    padding: 8px 6px;
     border-bottom: 1px solid #313244;
+    min-height: 18px;
 }
 
 QDockWidget::close-button,
@@ -1103,7 +1104,8 @@ QSint--ActionGroup QToolButton {
     color: #cdd6f4;
     border: none;
     border-radius: 4px;
-    padding: 6px;
+    padding: 8px 6px;
+    min-height: 18px;
 }
 
 QSint--ActionGroup QToolButton:hover {
@@ -1151,6 +1153,16 @@ SpreadsheetGui--SheetTableView QHeaderView::section {
     padding: 4px;
 }
 
+/* Spreadsheet cell editor - reduce padding for better text visibility */
+SpreadsheetGui--SheetTableView QLineEdit {
+    background-color: #313244;
+    color: #cdd6f4;
+    border: 1px solid #cba6f7;
+    border-radius: 0px;
+    padding: 1px 2px;
+    margin: 0px;
+}
+
 /* Python Console */
 Gui--PythonConsole {
     background-color: #11111b;