feat(webui): redesign admin key gate

Add a circular key-icon badge and a small "LLM Gateway" wordmark, so the
screen reads as this product's door and not a generic prompt.

Restructure the dense security paragraph into a short description plus a
three-item muted checklist. Each claim keeps its original strength: the
key stays in this tab's session storage, the browser never writes it to
disk, and requests go only to this page's own /admin/api/* routes.

Add a show/hide toggle for the key input. It reuses the ghost
icon-button composition SearchInput.vue already uses for its clear
button. Autofocus the input on mount. Disable submit while the trimmed
input is empty.

Add a brief shake on the key input when auth.error is set. The
animation respects prefers-reduced-motion and lives in a scoped
<style> block local to this file — the first one in webui/src/components,
added because no Tailwind-core or tw-animate-css keyframe reads as
"rejected".

Extend the header in App.vue with a GitHub repository link, per an
operator scope addition mid-task: an icon-only ghost button that opens
github.com/lukaszraczylo/traefik-llmgateway in a new tab. The link sits
in App.vue's header, above the gate/dashboard switch, so it renders on
every screen including the auth gate. Installs
@fortawesome/free-brands-svg-icons, pinned like the other fontawesome
packages, for the faGithub icon.

auth.submit() semantics, dashboard.refresh() timing, and the backend
stay unchanged.

webui/package-lock.json

@@ -9,6 +9,7 @@
       "version": "0.0.0",
       "dependencies": {
         "@fortawesome/fontawesome-svg-core": "^7.3.1",
+        "@fortawesome/free-brands-svg-icons": "^7.3.1",
         "@fortawesome/free-solid-svg-icons": "^7.3.1",
         "@fortawesome/vue-fontawesome": "^3.3.3",
         "@tanstack/vue-table": "^8.21.3",
@@ -688,6 +689,18 @@
         "node": ">=6"
       }
     },
+    "node_modules/@fortawesome/free-brands-svg-icons": {
+      "version": "7.3.1",
+      "resolved": "https://npm.fontawesome.com/@fortawesome/free-brands-svg-icons/-/free-brands-svg-icons-7.3.1.tgz",
+      "integrity": "sha512-8eiNzycuFhy3mZsi5EVO8JpO3H8l7/kSCl4Gk4iUew9hJuzYFqAAD6kqgeEup3+YZ9hL+5cjjorGzrRLkYuURg==",
+      "license": "(CC-BY-4.0 AND MIT)",
+      "dependencies": {
+        "@fortawesome/fontawesome-common-types": "7.3.1"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/@fortawesome/free-solid-svg-icons": {
       "version": "7.3.1",
       "resolved": "https://npm.fontawesome.com/@fortawesome/free-solid-svg-icons/-/free-solid-svg-icons-7.3.1.tgz",

webui/package.json

@@ -11,6 +11,7 @@
   },
   "dependencies": {
     "@fortawesome/fontawesome-svg-core": "^7.3.1",
+    "@fortawesome/free-brands-svg-icons": "^7.3.1",
     "@fortawesome/free-solid-svg-icons": "^7.3.1",
     "@fortawesome/vue-fontawesome": "^3.3.3",
     "@tanstack/vue-table": "^8.21.3",

webui/src/App.vue

@@ -1,9 +1,11 @@
 <script setup lang="ts">
+import { faGithub } from '@fortawesome/free-brands-svg-icons'
 import { faCircleExclamation } from '@fortawesome/free-solid-svg-icons'
 import { computed, defineAsyncComponent, onMounted, ref } from 'vue'
 
 import AuthGate from '@/components/AuthGate.vue'
 import OverviewView from '@/components/OverviewView.vue'
+import { Button } from '@/components/ui/button'
 import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs'
 import UsageView from '@/components/UsageView.vue'
 import { useAuthStore } from '@/stores/auth'
@@ -15,6 +17,10 @@ import { useDashboardStore } from '@/stores/dashboard'
 // lean; it fetches once, on first visit to the Charts tab.
 const ChartsView = defineAsyncComponent(() => import('@/components/ChartsView.vue'))
 
+/** The module path (go.mod / .traefik.yml `import:`) — same repo the plugin
+ * ships from, so this is the one canonical URL rather than a guess. */
+const GITHUB_REPO_URL = 'https://github.com/lukaszraczylo/traefik-llmgateway'
+
 const auth = useAuthStore()
 const dashboard = useDashboardStore()
 
@@ -34,7 +40,21 @@ onMounted(() => {
 <template>
   <div class="flex w-full flex-col gap-6 px-4 py-8 sm:px-6 lg:px-8">
     <header class="flex flex-col gap-1">
-      <h1 class="text-xl font-semibold tracking-tight">LLM Gateway &mdash; Admin</h1>
+      <div class="flex items-center justify-between gap-2">
+        <h1 class="text-xl font-semibold tracking-tight">LLM Gateway &mdash; Admin</h1>
+        <Button
+          as="a"
+          :href="GITHUB_REPO_URL"
+          target="_blank"
+          rel="noopener noreferrer"
+          variant="ghost"
+          size="icon"
+          aria-label="GitHub repository"
+          class="text-muted-foreground hover:text-foreground"
+        >
+          <FontAwesomeIcon :icon="faGithub" class="size-4" aria-hidden="true" />
+        </Button>
+      </div>
       <p class="flex items-center gap-1.5 text-sm text-muted-foreground">
         <FontAwesomeIcon v-if="dashboard.error" :icon="faCircleExclamation" class="size-3.5 text-destructive" />
         <span :class="dashboard.error ? 'text-destructive' : undefined">{{ statusText }}</span>

webui/src/components/AuthGate.vue

@@ -1,6 +1,6 @@
 <script setup lang="ts">
-import { faKey } from '@fortawesome/free-solid-svg-icons'
-import { ref } from 'vue'
+import { faCheck, faEye, faEyeSlash, faKey } from '@fortawesome/free-solid-svg-icons'
+import { computed, nextTick, onMounted, ref } from 'vue'
 
 import { Alert, AlertDescription, AlertTitle } from '@/components/ui/alert'
 import { Button } from '@/components/ui/button'
@@ -12,6 +12,13 @@ import { useDashboardStore } from '@/stores/dashboard'
 const auth = useAuthStore()
 const dashboard = useDashboardStore()
 const keyInput = ref('')
+const showKey = ref(false)
+const keyInputEl = ref<InstanceType<typeof Input> | null>(null)
+
+/** Disable submit until there's non-whitespace to send — matches the store's
+ * own `if (!key) return` guard in submit(), just surfaced to the button
+ * instead of silently no-op'ing on click. */
+const canSubmit = computed(() => keyInput.value.trim() !== '')
 
 function submit(): void {
   const value = keyInput.value
@@ -23,37 +30,101 @@ function submit(): void {
   // for up to 5s after key entry.
   void dashboard.refresh()
 }
+
+onMounted(() => {
+  // Autofocus the key field — this is the only control on the gate screen,
+  // so a keyboard/screen-reader user should land straight in it.
+  void nextTick(() => keyInputEl.value?.$el?.focus())
+})
 </script>
 
 <template>
   <div class="mx-auto flex min-h-[70vh] max-w-md flex-col justify-center px-4">
     <Card>
-      <CardHeader>
-        <CardTitle class="flex items-center gap-2">
-          <FontAwesomeIcon :icon="faKey" class="size-4 text-primary" />
-          Admin key required
-        </CardTitle>
-        <CardDescription>
-          Enter an admin API key. The browser keeps it only in this tab's session storage: it is
-          never written to disk and is sent only to this page's own /admin/api/* requests.
-        </CardDescription>
+      <CardHeader class="flex flex-col items-center gap-3 text-center">
+        <div class="flex size-12 items-center justify-center rounded-full bg-primary/10 text-primary">
+          <FontAwesomeIcon :icon="faKey" class="size-5" aria-hidden="true" />
+        </div>
+        <div class="flex flex-col items-center gap-1">
+          <span class="text-sm font-semibold text-foreground">LLM Gateway</span>
+          <CardTitle>Admin key required</CardTitle>
+        </div>
+        <CardDescription>Enter an admin API key to continue.</CardDescription>
       </CardHeader>
       <CardContent class="flex flex-col gap-4">
         <form class="flex flex-col gap-3" @submit.prevent="submit">
-          <Input
-            v-model="keyInput"
-            type="password"
-            autocomplete="off"
-            placeholder="API key"
-            aria-label="Admin API key"
-          />
-          <Button type="submit" class="w-full">Continue</Button>
+          <div class="relative">
+            <Input
+              ref="keyInputEl"
+              v-model="keyInput"
+              :type="showKey ? 'text' : 'password'"
+              autocomplete="off"
+              placeholder="API key"
+              aria-label="Admin API key"
+              class="h-10 pr-10 text-base"
+              :class="{ 'authgate-shake': auth.error }"
+            />
+            <Button
+              type="button"
+              variant="ghost"
+              size="icon-xs"
+              class="absolute top-1/2 right-1.5 -translate-y-1/2 text-muted-foreground hover:text-foreground"
+              :aria-label="showKey ? 'Hide key' : 'Show key'"
+              @click="showKey = !showKey"
+            >
+              <FontAwesomeIcon :icon="showKey ? faEyeSlash : faEye" class="size-3.5" aria-hidden="true" />
+            </Button>
+          </div>
+          <Button type="submit" class="w-full" :disabled="!canSubmit">
+            Continue
+          </Button>
         </form>
         <Alert v-if="auth.error" variant="destructive">
           <AlertTitle>Authentication failed</AlertTitle>
           <AlertDescription>{{ auth.error }}</AlertDescription>
         </Alert>
+        <ul class="flex flex-col gap-1.5 text-xs text-muted-foreground">
+          <li class="flex items-start gap-1.5">
+            <FontAwesomeIcon :icon="faCheck" class="mt-0.5 size-3 shrink-0" aria-hidden="true" />
+            <span>Kept only in this tab's session storage</span>
+          </li>
+          <li class="flex items-start gap-1.5">
+            <FontAwesomeIcon :icon="faCheck" class="mt-0.5 size-3 shrink-0" aria-hidden="true" />
+            <span>Never written to disk</span>
+          </li>
+          <li class="flex items-start gap-1.5">
+            <FontAwesomeIcon :icon="faCheck" class="mt-0.5 size-3 shrink-0" aria-hidden="true" />
+            <span>Sent only to this page's own /admin/api/* requests</span>
+          </li>
+        </ul>
       </CardContent>
     </Card>
   </div>
 </template>
+
+<style scoped>
+/*
+ * First scoped <style> block in webui/src/components — no other component
+ * needs one yet (grep confirms) but nothing in the Vite/@vitejs/plugin-vue
+ * pipeline forbids it, and the alternative (Tailwind-only) has no shake
+ * keyframe to compose from: Tailwind v4 core ships only pulse/bounce/spin/
+ * ping (node_modules/tailwindcss/theme.css), and tw-animate-css adds
+ * accordion/collapsible/enter/exit/caret-blink, none of which reads as
+ * "rejected". Contained to this file per the task's file-scope constraint.
+ *
+ * Applied only while auth.error is set (a failed submit), not on every
+ * render, so it communicates state rather than decorating the page.
+ */
+@keyframes authgate-shake {
+  10%, 90% { transform: translateX(-1px); }
+  20%, 80% { transform: translateX(2px); }
+  30%, 50%, 70% { transform: translateX(-4px); }
+  40%, 60% { transform: translateX(4px); }
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  .authgate-shake {
+    animation: authgate-shake 0.4s ease-in-out;
+  }
+}
+</style>