feat: enhance adaptive thinking model support and update UI components

- Added `isAdaptiveThinkingModel` utility to improve model identification logic in the AddFeatureDialog.
- Updated the ThinkingLevelSelector to conditionally display information based on available thinking levels.
- Enhanced model name formatting in agent-context-parser to include 'GPT-5.3 Codex' for better clarity.

These changes improve the user experience by refining model handling and UI feedback related to adaptive thinking capabilities.

apps/ui/src/components/views/board-view/shared/thinking-level-selector.tsx

@@ -46,7 +46,7 @@ export function ThinkingLevelSelector({
         ))}
       </div>
       <p className="text-xs text-muted-foreground">
-        {model && getThinkingLevelsForModel(model).includes('adaptive')
+        {levels.includes('adaptive')
           ? 'Adaptive thinking lets the model decide how much reasoning to use.'
           : 'Higher levels give more time to reason through complex problems.'}
       </p>