fix(ui): unify alert modal footer buttons and modal footer spacing

Align the alert form modal footer with the launch scan and triage note
modals: Cancel (outline) on the left, submit group on the right, all
size lg. Standardize the vertical gap between the last field and the
footer to 32px across the alert, launch scan, and triage modals.

ui/app/(prowler)/alerts/_components/alert-form-modal.tsx

@@ -594,22 +594,31 @@ const AlertFormModalContent = ({
         {errors.root && (
           <div className="text-text-error-primary text-sm">{errors.root}</div>
         )}
-        <div className="flex justify-end gap-2">
-          <Button variant="outline" onClick={() => onOpenChange(false)}>
+        {/* mt-4 lifts the gap-4 container spacing to 32px so the distance to
+            the footer matches the launch scan and triage note modals. */}
+        <div className="mt-4 flex w-full justify-between gap-4">
+          <Button
+            variant="outline"
+            size="lg"
+            onClick={() => onOpenChange(false)}
+          >
             Cancel
           </Button>
-          {editingAlert && (
-            <Button
-              variant="outline"
-              onClick={handlePreview}
-              disabled={previewLoading || saving}
-            >
-              {previewLoading ? "Running..." : "Test"}
+          <div className="flex gap-4">
+            {editingAlert && (
+              <Button
+                variant="outline"
+                size="lg"
+                onClick={handlePreview}
+                disabled={previewLoading || saving}
+              >
+                {previewLoading ? "Running..." : "Test"}
+              </Button>
+            )}
+            <Button size="lg" onClick={handleSubmit} disabled={saving}>
+              {submitLabel}
             </Button>
-          )}
-          <Button onClick={handleSubmit} disabled={saving}>
-            {submitLabel}
-          </Button>
+          </div>
         </div>
       </div>
     </Modal>

ui/components/findings/table/finding-note-modal.tsx

@@ -235,7 +235,9 @@ export function FindingNoteModal({
           </div>
         </div>
 
-        <div className="flex w-full justify-between gap-4">
+        {/* mt-3 lifts the gap-5 form spacing to 32px so the distance to the
+            footer matches the launch scan and alert modals. */}
+        <div className="mt-3 flex w-full justify-between gap-4">
           <Button
             type="button"
             variant="outline"