test: add unit tests for HexDump and useFileBinaryPreviewQuery

[mkitti]

Summary

Adds unit tests for the two new items introduced in the binary file display feature:

• hexDump.test.tsx (11 tests) — covers the HexDump component:

  • Correct offset, hex, and ASCII column formatting
  • Uppercase hex for offsets and byte values
  • Byte count display when not truncated
  • Truncation message when totalFileSize > bytes.length
  • Non-printable and null bytes replaced with . in ASCII column
  • Empty byte array
  • Mid-row gap after the 8th byte
  • Correct row count and offset values for multi-row input

• fileBinaryPreviewQuery.test.tsx (7 tests) — covers useFileBinaryPreviewQuery:

  • Returns Uint8Array from a 206 Partial Content response
  • Returns Uint8Array from a 200 OK response (server ignores Range)
  • Sets error state on non-ok response
  • Does not fetch when enabled is false
  • Does not fetch when fspName is undefined
  • Sends correct Range: bytes=0-511 header
  • Includes credentials: 'include' in the request

Test plan

• pixi run test-frontend — 18 test files, 124 tests, all passing

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