style: apply gradient to primary buttons in admin area

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/frontend/src/routes/admin/articles/+page.svelte

@@ -42,7 +42,7 @@
 <div class="py-3 sm:py-6 sm:pl-6">
   <div class="flex items-center justify-between mb-6 px-3 sm:px-0">
     <h1 class="text-2xl font-bold">{$_("admin.articles.title")}</h1>
-    <Button href="/admin/articles/new">
+    <Button href="/admin/articles/new" class="bg-gradient-to-r from-primary to-accent hover:from-primary/90 hover:to-accent/90">
       <span class="icon-[ri--add-line] h-4 w-4 mr-1"></span>{$_("admin.articles.new_article")}
     </Button>
   </div>

packages/frontend/src/routes/admin/articles/[id]/+page.svelte

@@ -195,7 +195,7 @@
     </label>
 
     <div class="flex gap-3 pt-2">
-      <Button onclick={handleSubmit} disabled={saving}>
+      <Button onclick={handleSubmit} disabled={saving} class="bg-gradient-to-r from-primary to-accent hover:from-primary/90 hover:to-accent/90">
         {saving ? $_("admin.common.saving") : $_("admin.common.save_changes")}
       </Button>
       <Button variant="outline" href="/admin/articles">{$_("common.cancel")}</Button>

packages/frontend/src/routes/admin/articles/new/+page.svelte

@@ -171,7 +171,7 @@
     </label>
 
     <div class="flex gap-3 pt-2">
-      <Button onclick={handleSubmit} disabled={saving}>
+      <Button onclick={handleSubmit} disabled={saving} class="bg-gradient-to-r from-primary to-accent hover:from-primary/90 hover:to-accent/90">
         {saving ? $_("admin.common.creating") : $_("admin.article_form.create")}
       </Button>
       <Button variant="outline" href="/admin/articles">{$_("common.cancel")}</Button>

packages/frontend/src/routes/admin/users/[id]/+page.svelte

@@ -164,7 +164,7 @@
     </label>
 
     <div class="flex gap-3">
-      <Button onclick={handleSave} disabled={saving}>
+      <Button onclick={handleSave} disabled={saving} class="bg-gradient-to-r from-primary to-accent hover:from-primary/90 hover:to-accent/90">
         {saving ? $_("admin.common.saving") : $_("admin.common.save_changes")}
       </Button>
     </div>

packages/frontend/src/routes/admin/videos/+page.svelte

@@ -40,7 +40,7 @@
 <div class="py-3 sm:py-6 sm:pl-6">
   <div class="flex items-center justify-between mb-6 px-3 sm:px-0">
     <h1 class="text-2xl font-bold">{$_("admin.videos.title")}</h1>
-    <Button href="/admin/videos/new">
+    <Button href="/admin/videos/new" class="bg-gradient-to-r from-primary to-accent hover:from-primary/90 hover:to-accent/90">
       <span class="icon-[ri--add-line] h-4 w-4 mr-1"></span>{$_("admin.videos.new_video")}
     </Button>
   </div>

packages/frontend/src/routes/admin/videos/[id]/+page.svelte

@@ -182,7 +182,7 @@
     {/if}
 
     <div class="flex gap-3 pt-2">
-      <Button onclick={handleSubmit} disabled={saving}>
+      <Button onclick={handleSubmit} disabled={saving} class="bg-gradient-to-r from-primary to-accent hover:from-primary/90 hover:to-accent/90">
         {saving ? $_("admin.common.saving") : $_("admin.common.save_changes")}
       </Button>
       <Button variant="outline" href="/admin/videos">{$_("common.cancel")}</Button>

packages/frontend/src/routes/admin/videos/new/+page.svelte

@@ -189,7 +189,7 @@
     {/if}
 
     <div class="flex gap-3 pt-2">
-      <Button onclick={handleSubmit} disabled={saving}>
+      <Button onclick={handleSubmit} disabled={saving} class="bg-gradient-to-r from-primary to-accent hover:from-primary/90 hover:to-accent/90">
         {saving ? $_("admin.common.creating") : $_("admin.video_form.create")}
       </Button>
       <Button variant="outline" href="/admin/videos">{$_("common.cancel")}</Button>