fix(webapp): give ask-ai buttons a pointer cursor from the variant

Moves the pointer cursor onto the ask-ai theme so every use gets it, instead of each call site passing a className, and reverts to the default cursor when disabled.

Author: samejr

apps/webapp/app/components/primitives/Buttons.tsx

@@ -119,7 +119,7 @@ const theme = {
   "ask-ai": {
     textColor: "text-text-bright transition group-disabled/button:text-text-dimmed/80",
     button:
-      "bg-secondary border border-[#41FF54]/25 group-hover/button:bg-surface-control group-hover/button:border-[#41FF54]/40 group-disabled/button:bg-secondary group-disabled/button:opacity-60 group-disabled/button:pointer-events-none",
+      "cursor-pointer bg-secondary border border-[#41FF54]/25 group-hover/button:bg-surface-control group-hover/button:border-[#41FF54]/40 group-disabled/button:bg-secondary group-disabled/button:opacity-60 group-disabled/button:cursor-default group-disabled/button:pointer-events-none",
     shortcut:
       "border-text-dimmed/40 text-text-dimmed group-hover/button:text-text-bright group-hover/button:border-text-dimmed",
     icon: "text-text-bright",

apps/webapp/app/routes/storybook.ai-agent/route.tsx

@@ -208,7 +208,6 @@ function AskAiButton({ variant, matrixSize }: { variant: ButtonVariant; matrixSi
     <Button
       variant={variant}
       onClick={trigger}
-      className="cursor-pointer"
       LeadingIcon={
         <AgentDotMatrix
           size={matrixSize}
@@ -240,7 +239,6 @@ function FaceButton({ name }: { name: DotShapeName }) {
     <Button
       variant="ask-ai/small"
       onClick={trigger}
-      className="cursor-pointer"
       LeadingIcon={
         <AgentDotMatrix
           size={16}