fix(app): iOS HIG Phase 6 — modals, dialogs & overlays

- PassphraseDialog: submit button h-10→h-11 (44px)
- ShareToNostr: close/cancel/publish buttons expanded to 44px
- ComparisonView: tab buttons min-h-[44px], gap-1→gap-2
- NostrProfileEditor: publish button min-h-[44px]
- NostrRelayManager: all action buttons expanded to 44px
- ChatHistory: conversation items min-h-[44px]

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/app/src/components/chat/ComparisonView.vue

@@ -1,11 +1,11 @@
 <template>
   <div class="flex flex-col h-full">
     <!-- Mobile tabs -->
-    <div class="flex md:hidden gap-1 px-3 pt-2">
+    <div class="flex md:hidden gap-2 px-3 pt-2">
       <button
         v-for="(tab, i) in tabs"
         :key="i"
-        class="flex-1 text-xs py-1.5 rounded-lg transition-all"
+        class="flex-1 text-sm min-h-[44px] rounded-lg transition-all"
         :class="activeTab === i
           ? 'bg-accent/20 text-accent'
           : 'text-white/50 hover:text-white/70'"