[Frontend] Replace local vault balance mutations with confirmed chain state

[grantfox-oss]

Files affected (5+): Frontend/src/hooks/useVault.ts, Frontend/src/lib/stellar.ts, Frontend/src/lib/api.ts, Frontend/src/stores/index.ts, Frontend/src/types/index.ts, Frontend/src/features/vaults/CreateVault.tsx, Frontend/src/features/vaults/VaultList.tsx, Frontend/src/features/vaults/VaultDetail.tsx
Description: useVault generates random IDs and directly changes local balances without creating or confirming a Soroban transaction.
Acceptance criteria:

Create vaults and deposits through wallet-signed transactions.

Show pending, failed, and confirmed transaction states.

Refresh vault state from authoritative backend/chain sources.

Prevent duplicate submission and optimistic double counting.

[Tobi-8]

please maintainer , assign me to this issue. I have looked through your description, and i have had experience in this type of issue.
kindly assign

[Ayinkx]

Hi i would like to work on this issue please assign to me
I can do it perfectly

[Heazzy500]

Hi, I’d appreciate the opportunity to contribute to this issue. I’m detail-oriented and committed to delivering quality work.