feat: redesign dashboard with Fluent KPI tiles, connection strip, and devices column

- Replace LCD-style readings with a 3×2 KPI tile grid (Fluent card surfaces, 52pt values)
- Add persistent top connection strip with horizontal chips + pump name badge
- Add elapsed test timer (DispatcherTimer, mm:ss) to Test Summary card
- Restyle Test Summary and Active Alarms with Fluent brushes/iconography
- Add Devices column (CAN / K-Line / Bench tiles) between KPI grid and test/alarms
  - Enumerates attached PCAN USB channels via PCAN_ATTACHED_CHANNELS API
  - Enumerates FTDI K-Line adapters via existing FtdiInterface helpers
  - Click to connect/disconnect; confirmation dialog when session active or test running
  - Hover tint: blue = will connect, red = will disconnect; Bench row is read-only stub
- Extend ICanService with SelectedChannel + EnumerateAttachedChannels()
- Expose IKwpService.ConnectedPort for active session device tracking
- Add DeviceRow button style with MultiDataTrigger hover colour logic
- Add 30+ new localization keys (ES + EN) for KPI labels, devices, confirmations

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

App.xaml

@@ -1,13 +1,21 @@
 <Application x:Class="HC_APTBS.App"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:ui="http://schemas.lepo.co/wpfui/2022/xaml"
              xmlns:local="clr-namespace:HC_APTBS">
     <Application.Resources>
         <ResourceDictionary>
             <ResourceDictionary.MergedDictionaries>
+
+                <!-- WPF-UI: must come first so app styles can override -->
+                <ui:ThemesDictionary Theme="Light"/>
+                <ui:ControlsDictionary/>
+
+                <!-- App resources -->
                 <ResourceDictionary Source="Resources/Strings.es.xaml"/>
                 <ResourceDictionary Source="Resources/Styles.xaml"/>
                 <ResourceDictionary Source="Resources/NavStyles.xaml"/>
+
             </ResourceDictionary.MergedDictionaries>
         </ResourceDictionary>
     </Application.Resources>