added validator and slots avail handler

[Mohsinsiddi]

Enhanced Staking Program Selection Flow

Changes

• Added new get_staking_slots_count method to check available slots for staking programs
• Improved staking program selection UI with better slot availability display
• Added validation to ensure users can only select programs with available slots
• Modified the selection flow to show available slots next to program names
• Special handling for "no staking" option to show infinite availability

Technical Details

• The new get_staking_slots_count method calculates available slots by:
  • Querying maxNumServices from the staking contract
  • Subtracting current services count from the maximum
  • Includes proper error handling for contract calls
• Selection UI now maintains a map of available choices with slot information
• Added input validation to prevent selection of programs with no available slots

Testing Notes

• Test the staking slot count functionality with both active and inactive contracts
• Verify "no staking" option shows infinite availability
• Confirm error handling when contract calls fail
• Test input validation for program selection

[OjusWiZard]

also, can this branch be deleted? feat/staking_slots_avail

[Mohsinsiddi]

also, can this branch be deleted? feat/staking_slots_avail

deleted