feat(leads): stabilize v3 layout and unify tab width logic

- Removed max-width constraints across leads modules for full-width stability.
- Fixed duplicate Download icon import causing build errors.
- Improved header responsiveness for mobile-first experience.
- Refined tab switching logic with state persistence placeholders.

documentation/Aether_Events_Exhibitor_Leads_v3.md

@@ -102,7 +102,7 @@ License:
 
 ## [tab 4] Manage / Config
 ### Exhibit Specific
-* Priorty/payment toggle - Administrator Access or above
+* Priority/payment toggle - Administrator Access or above
 * Max licenses (number) - readonly or edit for Administrator Access or above
 * Small devices (number) - readonly or edit for Administrator Access or above
 * Large devices (number) - readonly or edit for Administrator Access or above