feat: Add a 1px border to Dankbar w/edge detection

-  No edge gap (spacing = 0 AND corner radius = 0): Draws 1px border only on the exposed edge (bottom for top bar, top for bottom bar, right for left bar, left for right bar)
- Has edge gap (spacing > 0 OR corner radius > 0): Draws 1px border around all sides

Modules/Settings/DankBarTab.qml

@@ -1003,6 +1003,16 @@ Item {
                                            checked)
                                    }
                     }
+
+                    DankToggle {
+                        width: parent.width
+                        text: "Border"
+                        description: "Add a 1px border to the bar. Smart edge detection only shows border on exposed sides."
+                        checked: SettingsData.dankBarBorderEnabled
+                        onToggled: checked => {
+                                       SettingsData.setDankBarBorderEnabled(checked)
+                                   }
+                    }
                 }
             }