fix(popover): implement missing border width custom property

.changeset/ripe-symbols-wear.md

@@ -0,0 +1,5 @@
+---
+"@spectrum-css/popover": patch
+---
+
+Defines the missing `--spectrum-popover-border-width` custom property. The variable was already being used in our style definitions, but its value was lost at some point so it was undefined in the browser. This work should correct that.

components/popover/dist/metadata.json

@@ -144,6 +144,7 @@
     "--spectrum-animation-duration-0",
     "--spectrum-animation-duration-100",
     "--spectrum-background-layer-2-color",
+    "--spectrum-border-width-100",
     "--spectrum-corner-radius-large-default",
     "--spectrum-drop-shadow-elevated-blur",
     "--spectrum-drop-shadow-elevated-color",

components/popover/index.css

@@ -18,6 +18,7 @@
 	--spectrum-popover-animation-distance: var(--spectrum-spacing-100);
 
 	--spectrum-popover-background-color: var(--spectrum-background-layer-2-color);
+	--spectrum-popover-border-width: var(--spectrum-border-width-100);
 
 	/* TODO: Cannot use popover-border-color token until the value no longer has the rgba() function alpha/opacity. We should be able to refactor instances of `--spectrum-popover-border-color-rgb` with `--spectrum-popover-border-color` once this is available. */
 	/* --spectrum-popover-border-color-default: var(--spectrum-popover-border-color); */