Implement comprehensive error handling system with custom error types

[ISTIFANUS-N]

Task Description

Scope: Replace all panic!() macros with a structured Result-based error system

Acceptance Criteria

Acceptance Criteria:

• Define custom error enums for each module (Bridge, Escrow, Rewards)
• Implement proper error propagation through all contract functions
• Add error codes and user-friendly error messages
• Update all tests to handle Result types instead of expecting panics
• Ensure gas-efficient error handling patterns

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[LaGodxy]

@LaGodxy has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

Hello, I'm a fullStack developer with years of experience, I'll love to resolve this.

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[drips-wave]

Congratulations, @LaGodxy! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on January 31, 2026.

🧑‍💻 @LaGodxy: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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