fix(sdk): add timeout and reject path to waitForFillByDepositTx

[devtechedge]

Summary

waitForFillByDepositTx previously returned a Promise with only a resolve path. Polling continued forever on both "not yet filled" and unexpected errors, which could hang callers and keep the event loop alive indefinitely.

This change adds a reject path and a configurable timeout (default 5 minutes). When the deadline is reached, the Promise rejects with WaitForFillTimeoutError for the usual pending-fill case (NoFillLogError), or with the underlying error for other failures.

Changes

• Add timeout param to waitForFillByDepositTx (default DEFAULT_WAIT_FOR_FILL_TIMEOUT_MS = 300000)
• Reject via WaitForFillTimeoutError when polling exceeds the deadline
• Keep retrying until the timeout so transient indexer/RPC misses still have a chance to succeed
• Add unit tests covering the timeout rejection path

Test plan

• vitest run test/unit/actions/waitForFillByDepositTx.test.ts (timeout rejection + default timeout constant)
• Reviewers: confirm 5 minute default is reasonable for the indexer fallback path, or suggest a different default
• Reviewers: confirm callers that need longer waits can pass timeout explicitly

Fixes #271

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