fix(sdk-coin-starknet): normalize signableHex and widen verifyTransaction guard #3389

Job	Run time
Generate merge base API spec	6m 29s
Generate head API spec	7m 55s
Check specs identical	7s
API Spec Check	3s
Check breaking changes	-1s
Generate vacuum reports for API spec	-1s
Linter Override	-1s
	14m 31s

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