[Testing] Add contract tests for cancelling and withdrawing paused streams

[ogazboiz]

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Why this matters

The on-chain withdraw and cancel_stream flows differ in an important way that is not directly tested: cancel_stream (contracts/stream_contract/src/lib.rs) settles the recipient's accrued amount even when the stream is paused, whereas withdraw explicitly rejects when stream.paused is true. Today the contract test suite covers pause stopping accrual (test_pause_stops_accrual) and resume adjusting end time, but there is no test that cancels a currently-paused stream and asserts the settlement/refund split is computed from paused_at (frozen accrual) rather than now. This is exactly the kind of edge case where a regression would silently misallocate user funds.

Acceptance criteria

• Add a test in contracts/stream_contract/src/test.rs that: creates a stream, advances time, pauses it, advances time further while paused, then cancels — and asserts the recipient receives only the amount accrued up to paused_at and the sender is refunded the rest.
• Add a test asserting withdraw on a paused stream returns StreamInactive (locking in current behavior).
• Add a test that resuming then cancelling settles correctly across the pause boundary.

Files to touch

• contracts/stream_contract/src/test.rs

Out of scope

• Property-based / fuzz invariants (covered by existing open issues).
• Changing contract behavior.

[emdevelopa]

@emdevelopa has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hiii maintainer i'd like to jump on this issue

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