feat(assistant): add multi-dialog UX, task-aware llm settings, and i18n cleanup

frontend/src/routes/git/+page.svelte

@@ -64,10 +64,10 @@
 </script>
 
 <div class="max-w-6xl mx-auto p-6">
-  <PageHeader title="Git Dashboard Management">
+  <PageHeader title={$t.git?.management || "Git Management"}>
     <div slot="actions" class="flex items-center space-x-4">
       <Select
-        label="Environment"
+        label={$t.dashboard?.environment || "Environment"}
         bind:value={selectedEnvId}
         options={environments.map(e => ({ value: e.id, label: e.name }))}
       />
@@ -79,15 +79,15 @@
       <div class="animate-spin rounded-full h-8 w-8 border-b-2 border-blue-600"></div>
     </div>
   {:else}
-    <Card title="Select Dashboard to Manage">
+    <Card title={$t.git?.select_dashboard || "Select Dashboard to Manage"}>
       {#if fetchingDashboards}
-        <p class="text-gray-500">Loading dashboards...</p>
+        <p class="text-gray-500">{$t.common?.loading || "Loading..."}</p>
       {:else if dashboards.length > 0}
         <DashboardGrid {dashboards} />
       {:else}
-        <p class="text-gray-500 italic">No dashboards found in this environment.</p>
+        <p class="text-gray-500 italic">{$t.dashboard?.no_dashboards || "No dashboards found in this environment."}</p>
       {/if}
     </Card>
   {/if}
 </div>
-<!-- [/DEF:GitDashboardPage:Component] -->
+<!-- [/DEF:GitDashboardPage:Component] -->