fix: enforce mint extension checks in cToken-to-cToken decompress

[ananas-block]

Add enforce_extension_state() to MintExtensionChecks and call it in the Decompress branch when decompress_inputs is None (hot-path, not CompressedOnly restore). This prevents cToken-to-cToken transfers from bypassing pause, transfer fee, and transfer hook restrictions.

Summary by CodeRabbit

• Bug Fixes

  • Enhanced validation checks during token decompression operations to enforce proper extension states.

• Chores

  • Refactored extension state validation logic for improved code organization and maintainability.

[coderabbitai]

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📝 Walkthrough

Walkthrough

Two related modules in the compressed token extension system are enhanced: a new enforce_extension_state() method is added to MintExtensionChecks to centralize validation logic, and the Decompress path in compress_or_decompress_ctokens invokes this check as a precondition before proceeding with decompression.

Changes

Cohort / File(s)	Summary
Validation Centralization programs/compressed-token/program/src/extensions/check_mint_extensions.rs	Introduced new enforce_extension_state() public method that consolidates paused state, transfer fee, and transfer hook validations. Refactored existing check_mint_extensions() to delegate to this new method, eliminating inline state checks.
Decompress Precondition programs/compressed-token/program/src/compressed_token/transfer2/compression/ctoken/compress_or_decompress_ctokens.rs	Added early precondition check in Decompress branch that invokes enforce_extension_state() via available mint_checks when decompress_inputs is None, running before validate_and_apply_compressed_only().

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• fix: top up or rent transfer mint to ctoken #2053: Directly introduces the call to MintExtensionChecks::enforce_extension_state() in the Decompress path of compress_or_decompress_ctokens.
• fix: compressed and close mint check #2094: Modifies the same Decompress flow in compress_or_decompress_ctokens.rs and may interact with this precondition logic.

Suggested labels

ai-review

Suggested reviewers

• sergeytimoshin
• SwenSchaeferjohann

Poem

🎯 A guard stands tall before decompression's door,
Enforcing mint extension states with care,
Paused, fees, and hooks validated once more—
Logic extracted, centralized, and fair. ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding enforcement of mint extension checks during cToken-to-cToken decompress operations to prevent bypassing pause, transfer fee, and transfer hook restrictions.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 70.00%.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch jorrit/fix-ctoken-ctoken-transfer-mint-checks

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