Remove orphaned key import/generate UI

Phase 3 (auto-provision merchant from account keypair) removed the
generateKeys / importKeys methods and the dialog data fields, but
left the dialog templates and dropdown menu items behind. They
referenced importKeyDialog.show and generateKeyDialog.show, which
were now undefined — breaking the merchant dashboard with
"Cannot read properties of undefined (reading 'show')".

Removes:
- The Import Key and Generate New Key dialogs from index.html
- The corresponding dropdown items from merchant-tab.html
- The 'import-key' and 'generate-key' emits from merchant-tab.js
- The dangling @import-key / @generate-key listeners in index.html

Merchants are auto-provisioned from the account keypair on first
GET; key rotation is handled by the migrate-keys feature instead.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

static/components/merchant-tab.js

@@ -19,9 +19,7 @@ window.app.component('merchant-tab', {
     'merchant-deleted',
     'toggle-merchant-state',
     'restart-nostr-connection',
-    'profile-updated',
-    'import-key',
-    'generate-key'
+    'profile-updated'
   ],
   data: function () {
     return {

templates/nostrmarket/components/merchant-tab.html

@@ -64,25 +64,6 @@
                     </q-btn>
                   </q-item-section>
                 </q-item>
-                <q-separator></q-separator>
-                <q-item clickable v-close-popup @click="$emit('import-key')">
-                  <q-item-section avatar>
-                    <q-icon name="vpn_key" color="primary"></q-icon>
-                  </q-item-section>
-                  <q-item-section>
-                    <q-item-label>Import Existing Key</q-item-label>
-                    <q-item-label caption>Use an existing nsec</q-item-label>
-                  </q-item-section>
-                </q-item>
-                <q-item clickable v-close-popup @click="$emit('generate-key')">
-                  <q-item-section avatar>
-                    <q-icon name="add" color="primary"></q-icon>
-                  </q-item-section>
-                  <q-item-section>
-                    <q-item-label>Generate New Key</q-item-label>
-                    <q-item-label caption>Create a fresh nsec</q-item-label>
-                  </q-item-section>
-                </q-item>
               </q-list>
             </q-btn-dropdown>
             <q-btn

templates/nostrmarket/index.html

@@ -102,8 +102,6 @@
               @merchant-deleted="handleMerchantDeleted"
               @toggle-merchant-state="toggleMerchantState"
               @restart-nostr-connection="restartNostrConnection"
-              @import-key="showImportKeysDialog"
-              @generate-key="generateKeys"
               @profile-updated="getMerchant"
             ></merchant-tab>
           </q-tab-panel>
@@ -367,89 +365,6 @@
     </div>
   </div>
 
-  <div>
-    <q-dialog v-model="importKeyDialog.show" position="top">
-      <q-card class="q-pa-lg q-pt-xl" style="width: 500px">
-        <q-form @submit="importKeys" class="q-gutter-md">
-          <q-input
-            filled
-            dense
-            v-model.trim="importKeyDialog.data.privateKey"
-            label="Private Key (hex or nsec)"
-          ></q-input>
-          <div class="row q-mt-lg">
-            <q-btn
-              unelevated
-              color="primary"
-              :disable="!importKeyDialog.data.privateKey"
-              type="submit"
-              >Import</q-btn
-            >
-            <q-btn v-close-popup flat color="grey" class="q-ml-auto"
-              >Cancel</q-btn
-            >
-          </div>
-        </q-form>
-      </q-card>
-    </q-dialog>
-  </div>
-
-  <!-- Generate Key Dialog -->
-  <q-dialog v-model="generateKeyDialog.show" position="top">
-    <q-card class="q-pa-lg q-pt-xl" style="width: 500px">
-      <div class="text-h6 q-mb-md">Generate New Key</div>
-      <div class="q-mb-md">
-        <div class="text-subtitle2 q-mb-xs">Public Key (npub)</div>
-        <q-input :model-value="generateKeyDialog.npub" readonly dense outlined>
-          <template v-slot:append>
-            <q-btn
-              flat
-              dense
-              icon="content_copy"
-              @click="copyText(generateKeyDialog.npub, 'npub copied!')"
-            ></q-btn>
-          </template>
-        </q-input>
-      </div>
-      <div class="q-mb-md">
-        <div class="text-subtitle2 q-mb-xs text-warning">
-          <q-icon name="warning" size="xs"></q-icon>
-          Private Key (nsec)
-        </div>
-        <q-input
-          :model-value="generateKeyDialog.showNsec ? generateKeyDialog.nsec : '••••••••••••••••••••••••••••••••••••••••••••••'"
-          readonly
-          dense
-          outlined
-        >
-          <template v-slot:append>
-            <q-btn
-              flat
-              dense
-              :icon="generateKeyDialog.showNsec ? 'visibility_off' : 'visibility'"
-              @click="generateKeyDialog.showNsec = !generateKeyDialog.showNsec"
-            ></q-btn>
-            <q-btn
-              flat
-              dense
-              icon="content_copy"
-              @click="copyText(generateKeyDialog.nsec, 'nsec copied! Keep it safe!')"
-            ></q-btn>
-          </template>
-        </q-input>
-        <div class="text-caption text-negative q-mt-xs">
-          <q-icon name="error" size="xs"></q-icon>
-          Never share your private key!
-        </div>
-      </div>
-      <div class="row q-mt-lg">
-        <q-btn unelevated color="primary" @click="confirmGenerateKey"
-          >Create Merchant</q-btn
-        >
-        <q-btn v-close-popup flat color="grey" class="q-ml-auto">Cancel</q-btn>
-      </div>
-    </q-card>
-  </q-dialog>
 </div>
 {% endblock%}{% block scripts %} {{ window_vars(user) }}