feat: implement multi-wallet support (Freighter + Albedo)

[sweetesty]

Description

Implemented multi-wallet support for Freighter and Albedo, allowing users to connect and manage multiple Stellar wallets within the application.

Changes

• Added wallet selection UI for choosing between Freighter and Albedo
• Implemented compatible connection logic for both wallet providers
• Abstracted wallet connection logic into a unified interface using provider-specific SDKs
• Added smooth wallet switching without breaking session state
• Implemented fallback handling when a wallet is unavailable or fails to connect
• Persisted selected wallet preference across the user session
• Added graceful error handling with toast notifications for user feedback
• Designed with extensibility in mind for future Stellar wallet integrations

Acceptance Criteria Met

• Wallet selection UI is functional for both Freighter and Albedo
• Switching between wallets works without disrupting session state
• Fallback handling is in place for unavailable or failing wallets
• Selected wallet preference is persisted for the session

Related Issue

Closes #134

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[SudiptaPaul-31]

@sweetesty resolve conflicts

[sweetesty]

resolved @SudiptaPaul-31