Give the guest setting somewhere to be changed

Reported: no Tools section in Settings. The setting existed in the database and
had no page, which from a person's side is indistinguishable from the feature
not existing.

get_settings_defaults SEEDS a setting. get_settings_cards (ADR-010) is what puts
it in the rail. Declaring only the first is a silent half-feature: nothing fails,
no test notices, and the switch is unreachable.

The page states the cost where the DECISION is made rather than in a document
nobody opens - turn it on and it says a guest-created link records no creator,
so the audit trail can say when and from where but never who.

Admin-only, like every other settings page, because this one decides whether an
unauthenticated caller may write to the site.

Also caught while wiring it: the card asked for a 'shield' icon, which is not in
the settings iconMap, so it would have rendered the fallback puzzle piece - the
glyph that reads as "nobody chose this". Uses wrench, matching Tech Tools.

The row still comes from `flask plugin upgrade-all`; the card appears either
way, and without the row the page loads empty.

plugins/tools/frontend/routes.js

@@ -28,6 +28,14 @@ export default [
     // Browser-only: no API, no data, nothing to protect.
     meta: { plugin: 'tools' }
   },
+  {
+    path: 'settings/secure-send',
+    name: 'secure-send-settings',
+    component: () => import('./views/SecureSendSettings.vue'),
+    // Admin, like every other settings page: this decides whether an
+    // unauthenticated caller may write to the site.
+    meta: { requiresAuth: true, requiresAdmin: true, plugin: 'tools' }
+  },
   {
     path: 'tools/secure-send',
     name: 'tools-secure-send',

plugins/tools/frontend/views/SecureSendSettings.vue

@@ -0,0 +1,77 @@
+<template>
+  <div>
+    <div class="page-header">
+      <h1>Secure Send</h1>
+    </div>
+
+    <div v-if="loading" class="card loading">Loading...</div>
+
+    <div v-else class="card">
+      <label class="switch-row">
+        <input v-model="allowGuests" type="checkbox" />
+        <span>
+          <strong>Let people without an account create links</strong>
+          <span class="hint">
+            Off by default. With it off, creating a link needs a login and the
+            <code>tools.secrets</code> permission. Receiving one never needs an
+            account either way.
+          </span>
+        </span>
+      </label>
+
+      <!-- The cost, stated where the decision is made rather than in a document
+           nobody opens. -->
+      <p class="control-note" v-if="allowGuests">
+        A link created by a guest has no creator recorded. The audit trail can
+        say when it was made and from where, but never who made it.
+      </p>
+
+      <button class="btn btn-primary" :disabled="saving" @click="save">
+        {{ saving ? 'Saving...' : 'Save' }}
+      </button>
+      <span v-if="saved" class="saved">Saved</span>
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { ref, onMounted } from 'vue'
+import { settingsApi } from '@/api'
+
+const KEY = 'securesend_allow_guests'
+
+const allowGuests = ref(false)
+const loading = ref(true)
+const saving = ref(false)
+const saved = ref(false)
+
+onMounted(async () => {
+  try {
+    const response = await settingsApi.list({ category: 'tools' })
+    const rows = response.data.data || []
+    const row = rows.find(setting => setting.key === KEY)
+    allowGuests.value = String(row?.value).toLowerCase() === 'true'
+  } finally {
+    loading.value = false
+  }
+})
+
+async function save() {
+  saving.value = true
+  try {
+    await settingsApi.update(KEY, allowGuests.value ? 'true' : 'false')
+    saved.value = true
+    setTimeout(() => { saved.value = false }, 2000)
+  } finally {
+    saving.value = false
+  }
+}
+</script>
+
+<style scoped>
+.switch-row { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 1rem; }
+.switch-row span { display: block; }
+.hint { display: block; color: var(--text-light); font-size: 0.875rem; margin-top: 4px; }
+.control-note { color: var(--warning); font-size: 0.875rem; margin: 0 0 1rem; }
+.saved { margin-left: 10px; color: var(--text-light); font-size: 0.875rem; }
+</style>

plugins/tools/plugin.py

@@ -92,6 +92,28 @@ class ToolsPlugin(BasePlugin):
             },
         ]
 
+    def get_settings_cards(self) -> List[dict]:
+        """A page for the one switch this plugin owns (ADR-010).
+
+        get_settings_defaults SEEDS the row; this is what gives somebody a place
+        to change it. Declaring only the first left the setting in the database
+        with no way to reach it, which is indistinguishable from the feature not
+        existing.
+        """
+        return [
+            {
+                'group': 'Tools',
+                'to': '/settings/secure-send',
+                # From the settings iconMap; an unknown key falls back to a
+                # puzzle piece, which reads as "nobody chose this".
+                'icon': 'wrench',
+                'title': 'Secure Send',
+                'description': 'Whether people without an account can create '
+                               'one-view password links',
+                'position': 60,
+            },
+        ]
+
     def get_navigation_items(self) -> List[dict]:
         return [
             {