Add none gap option to Stack component (#3864)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: HiroAgustin <1458873+HiroAgustin@users.noreply.github.com>
Co-authored-by: primer-css <primer-css@users.noreply.github.com>

Author: 3 people

.changeset/add-stack-none-gap.md

@@ -0,0 +1,5 @@
+---
+"@primer/view-components": minor
+---
+
+Add `none` gap option to Stack component for parity with Primer React

app/components/primer/alpha/stack.rb

@@ -117,6 +117,7 @@ class GapArg < Primer::ResponsiveArg
         DEFAULT = nil
         OPTIONS = [
           DEFAULT,
+          :none,
           :condensed,
           :normal,
           :spacious

static/arguments.json

@@ -2616,7 +2616,7 @@
         "name": "gap",
         "type": "Symbol",
         "default": "`GapArg::DEFAULT`",
-        "description": "Specify the gap between children elements in the stack. One of `nil`, `:condensed`, `:normal`, or `:spacious`."
+        "description": "Specify the gap between children elements in the stack. One of `nil`, `:condensed`, `:none`, `:normal`, or `:spacious`."
       },
       {
         "name": "direction",

static/info_arch.json

@@ -8079,7 +8079,7 @@
         "name": "gap",
         "type": "Symbol",
         "default": "`GapArg::DEFAULT`",
-        "description": "Specify the gap between children elements in the stack. One of `nil`, `:condensed`, `:normal`, or `:spacious`."
+        "description": "Specify the gap between children elements in the stack. One of `nil`, `:condensed`, `:none`, `:normal`, or `:spacious`."
       },
       {
         "name": "direction",