theme: refine v_native styles

src/resources/themes/v_native/v_native.palette

@@ -7,7 +7,7 @@ mdhl_file=v_native.mdhl
 css_file=v_native.css
 codeblock_css_file=v_native_codeblock.css
 mermaid_css_file=v_native_mermaid.css
-version=16
+version=17
 
 [phony]
 ; Abstract color attributes.

src/resources/themes/v_native/v_native.qss

@@ -205,6 +205,7 @@ QPushButton[TitleBtn="true"]:default {
 }
 
 QPushButton[DangerBtn="true"] {
+    padding: 3px 20px 3px 20px;
     color: @pushbutton_dangerbtn_fg;
     border: none;
     background-color: @pushbutton_dangerbtn_bg;