feat: add 10% campaign reserve pool and fix mobile sponsor button

[Hahfyeex]

• Implement automatic 10% reserve pool for tree replacement

  • Add Reserve storage key to DataKey enum
  • Add ReserveAllocatedEvent for tracking reserve allocation
  • Add calculate_reserve helper function (10% = 1000 bps)
  • Add distribute_proceeds helper for team/creator payouts
  • Modify claim_funds to deduct reserve after protocol fee
  • Reserve is held in contract storage for verification failures
  • Add TeamPayoutIssuedEvent for team member distributions
  • Add ContractFullEvent and ContractFull error code

• Fix mobile sponsor button stuck disabled state

  • Add loading state management to SponsorTeamDashboard
  • Add isSubmittingTeam, isSubmittingInvite, isSubmittingTree states
  • Wrap all submission handlers in try-catch-finally blocks
  • Properly reset button states after success or error
  • Disable inputs during submission to prevent race conditions
  • Add loading text feedback (Creating..., Inviting..., Adding...)

Closes #715
Closes #732

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[coderabbitai]

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[Utilitycoder]

Thanks for the work. Kindly ensure you offramp with Fundable at https://stellar.fundable.finance/offramp