Fix subpixel gap between release cycle mask rects

Fix subpixel gap by widening white part by 1 pixel into black area, and moving gradient mask to top in z order

Author: qb20nh

_tools/release_cycle_template.svg.jinja

@@ -169,18 +169,18 @@
             fill="black"
         />
         <rect
-            x="{{ legend_width - right_margin }}"
+            x="{{ legend_width - 1 }}"
             y="0"
-            width="{{ right_margin }}"
+            width="{{ diagram_width + 1 }}"
             height="{{ diagram_height }}"
-            fill="url(#release-cycle-mask-gradient-{{ id_key }})"
+            fill="white"
         />
         <rect
-            x="{{ legend_width }}"
+            x="{{ legend_width - right_margin }}"
             y="0"
-            width="{{ diagram_width }}"
+            width="{{ right_margin }}"
             height="{{ diagram_height }}"
-            fill="white"
+            fill="url(#release-cycle-mask-gradient-{{ id_key }})"
         />
     </mask>