feat(ui): settings polish — button retune, daemon card, RPC 2-row, chat preview

Settings tabs brought closer to the approved mockup:
- ActionButton/renderCardButton retune (settings-scoped): 7px radius, 9px
  padX, Primary → accent-outline chip, Secondary/card buttons more defined.
- Daemon-binary card: compact status right-aligned on the DAEMON BINARY
  heading (Up to date / Version differs / Not installed), filled/rounded
  status box, neutral danger divider (was alarming red), roomier spacing.
- RPC Connection: two-row column-aligned layout (Host | Port, then
  Username | Password) so the password no longer clips off the card edge.
- Chat settings tab: live conversation preview below the Appearance /
  Messaging cards; "Focus input on open" checkbox reflowed onto the console
  color-toggle row.
- Debug Options: "Current theme only" toggle restricts either screenshot
  sweep to the active theme instead of cycling every skin.
- Tabs fill the full content width (content-max-width cap disabled) and the
  sidebar nav panel centers within the true visible area.
- i18n: new keys for the above (untranslated keys fall back to English).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app_sweep.cpp

@@ -704,6 +704,10 @@ void App::startSweepImpl(bool full)
         if (sk.valid) sweep_skins_.push_back(sk.id);
     if (sweep_skins_.empty()) return;
 
+    // Debug Options "Current theme only": sweep just the active skin instead of cycling every theme.
+    if (sweep_current_theme_only_)
+        sweep_skins_.assign(1, ui::schema::SkinManager::instance().activeSkinId());
+
     sweep_full_ = full;
     if (full) { capture_mode_ = true; installDemoWalletData(); }
     buildSweepCatalog();