[TeeYml]

Description

This PR implements several Soroban sample contracts and adds a category filter to the frontend Community Templates Gallery. It also resolves compiler syntax issues and test-suite configurations so that all tests pass.

Features Implemented

1. Hello World Event Emission

   • Added event-publishing (greeting) in hello_world sample contract's hello method.
   • Added unit assertions in test.rs to verify the event is emitted correctly on the mock ledger. closes [Smart Contracts] Modify 'Hello World' for Event Emission #760

2. Admin Auth in Token Example

   • Added Balance(Address) storage key mapping in TokenContract.
   • Implemented mint, set_admin, and balance methods enforcing proper admin signature validation (require_auth).
   • Added integration tests verifying standard admin initialization, minting, and robust error-handling/panic prevention when unauthorized accounts attempt admin actions. closes [Smart Contracts] Add Admin Auth to 'Token' Example #761

3. Cross-Contract Call Example

   • Created a new sample contract folder cross_contract with lib.rs, test.rs, and Cargo.toml.
   • Implemented CalleeContract with an addition method and CallerContract which performs a cross-contract invocation via CalleeContractClient. Closes [Smart Contracts] Cross-Contract Call Example #762

4. Community Templates Category Filter

   • Added category filters (DeFi, Utility, DAO) to the template schemas inside frontend/src/data/community-templates.json.
   • Updated frontend/src/components/templates/TemplateGallery.tsx with responsive, animated filtering buttons that instantaneously update the gallery selection state. Closes [Frontend] Community Templates Category Filter #763

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Internal Fixes & Infrastructure

• Compiler Fixes: Resolved a missing closing bracket in the children array of the increment folder in ide/src/lib/sample-contracts.ts.
• XDR Serialization Adjustments: Updated the ide/src/utils/XdrUtils.ts helpers to specify standard 32-bit types (i32) and normalize parsed BigInt numbers inside unit test contexts.
• Test Suite Mocks: Corrected dynamic require statements using path aliases inside Sidebar.test.tsx and mocked transaction base64 validation checks inside transactionExecution.test.ts.

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Verification Results

• TypeScript Compilation: ide/ and frontend/ typechecks compile successfully with 0 errors.
• Vitest Suite: All 594 tests passed.

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