Add desktop dialogs framework (#5605)

### Summary

Adds desktop dialog framework with data-driven dialog definitions.

### Changes

- Data-driven dialog structure in `desktopDialogs.ts`
- Dynamic dialog view component with i18n support
- Button action types: openUrl, close, cancel
- Button severity levels for styling (primary, secondary, danger, warn)
- Fallback invalid dialog for error handling
- i18n collection script updated for dialog strings

src/assets/css/style.css

@@ -66,6 +66,8 @@
   --color-charcoal-700: #202121;
   --color-charcoal-800: #171718;
 
+  --color-neutral-550: #636363;
+
   --color-stone-100: #444444;
   --color-stone-200: #828282;
   --color-stone-300: #bbbbbb;
@@ -103,6 +105,10 @@
   --color-danger-100: #c02323;
   --color-danger-200: #d62952;
 
+  --color-coral-red-600: #973a40;
+  --color-coral-red-500: #c53f49;
+  --color-coral-red-400: #dd424e;
+
   --color-bypass: #6a246a;
   --color-error: #962a2a;