fix(ui): wifi setup on a fresh install — reveal toggle + a no-network callout (#145)

Two reports from a fresh install without a cable:

(a) No way to see the WiFi password being typed. Every password field in
    the app was a bare type=password input. PasswordRevealInput is the
    reusable fix — masked by default, one-tap eye toggle, v-model and
    enter pass-through — first applied to the WiFi prompt in ServerModals
    so a long key typed from across the room can be verified.

(b) WiFi settings are undiscoverable with no wired internet. New
    OnboardingNetworkCallout floats over every onboarding step when the
    node has NO physical link at all (no ethernet up, no WiFi associated
    — polled from network.list-interfaces, self-dismissing the moment a
    link exists) and deep-links 'Connect to WiFi' to
    /dashboard/server?open=wifi, which Server.vue consumes by popping the
    WiFi picker on arrival. Deliberately scoped the other way too:
    Archipelago is offline-first, so 'no internet' never nags — only 'no
    link at all', only during onboarding (the wrapper hosts /login too;
    the callout is restricted to /onboarding/* routes), and a failed probe
    stays silent. The query is consumed via history.replaceState so a
    KeepAlive tab-return never re-pops the modal, and Server.vue keeps
    reading it from the real URL rather than vue-router — its
    KeepAlive-mounted tests have no router context to give.

Verification: full frontend suite 1023/1023; type-check clean; production
build clean with both new strings confirmed in the emitted bundles
(OnboardingWrapper + Server chunks).

neode-ui/src/components/PasswordRevealInput.vue

@@ -0,0 +1,55 @@
+<template>
+  <div class="relative">
+    <input
+      :type="revealed ? 'text' : 'password'"
+      :value="modelValue"
+      :placeholder="placeholder"
+      :disabled="disabled"
+      :autocomplete="autocomplete"
+      class="w-full px-3 py-2 pr-10 bg-white/5 border border-white/10 rounded-lg text-white text-sm placeholder-white/30 focus:outline-none focus:border-white/30 disabled:opacity-50 disabled:cursor-not-allowed"
+      @input="$emit('update:modelValue', ($event.target as HTMLInputElement).value)"
+      @keyup.enter="$emit('enter')"
+    >
+    <button
+      type="button"
+      class="absolute inset-y-0 right-0 px-3 text-white/40 hover:text-white/80 transition-colors"
+      :aria-label="revealed ? 'Hide password' : 'Show password'"
+      :title="revealed ? 'Hide password' : 'Show password'"
+      @click="revealed = !revealed"
+    >
+      <!-- eye -->
+      <svg v-if="!revealed" class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 12a3 3 0 11-6 0 3 3 0 016 0z" />
+        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M2.458 12C3.732 7.943 7.523 5 12 5c4.478 0 8.268 2.943 9.542 7-1.274 4.057-5.064 7-9.542 7-4.477 0-8.268-2.943-9.542-7z" />
+      </svg>
+      <!-- eye-off -->
+      <svg v-else class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13.875 18.825A10.05 10.05 0 0112 19c-4.478 0-8.268-2.943-9.543-7a9.97 9.97 0 011.563-3.029m5.858.908a3 3 0 114.243 4.243M9.878 9.878l4.242 4.242M9.88 9.88l-3.29-3.29m7.532 7.532l3.29 3.29M3 3l3.59 3.59m0 0A9.953 9.953 0 0112 5c4.478 0 8.268 2.943 9.543 7a10.025 10.025 0 01-4.132 5.411m0 0L21 21" />
+      </svg>
+    </button>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref } from 'vue'
+
+/**
+ * Password input with a reveal toggle (#145). Introduced for the WiFi SSID
+ * password — a fresh-install user typing a long wifi key into a TV from
+ * across the room needs to see what they typed — and written reusable so
+ * other password fields can adopt it without re-deriving the eye icon.
+ */
+defineProps<{
+  modelValue: string
+  placeholder?: string
+  disabled?: boolean
+  autocomplete?: string
+}>()
+
+defineEmits<{
+  (e: 'update:modelValue', value: string): void
+  (e: 'enter'): void
+}>()
+
+const revealed = ref(false)
+</script>