fix: read wRTC dashboard fixtures as UTF-8

[Asti1982]

Summary

• read the wRTC bridge dashboard HTML/JS fixtures with explicit UTF-8 encoding
• keep the static dashboard tests portable on Windows hosts where the default codec is cp1252
• add the SPDX header required by the repository checks for the changed test file

Root cause

test_bridge_dashboard.py opened UTF-8 files without an encoding. On Windows, Python can default to cp1252, so the dashboard's Unicode title/arrows raise UnicodeDecodeError before the assertions run.

Validation

• python -m pytest tools\wrtc-bridge-dashboard\test_bridge_dashboard.py -q -> 27 passed
• python -m py_compile tools\wrtc-bridge-dashboard\test_bridge_dashboard.py
• git diff --check -- tools\wrtc-bridge-dashboard\test_bridge_dashboard.py
• python tools\bcos_spdx_check.py --base-ref origin/main

[github-actions]

Welcome to RustChain! Thanks for your first pull request.

Before we review, please make sure:

• Your PR has a BCOS-L1 or BCOS-L2 label
• New code files include an SPDX license header
• You've tested your changes against the live node

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[idan57570-art]

Code looks clean. Approved for merge.

[saim256]

Reviewed current head b1af11a. The change is narrowly scoped to the dashboard test fixture reads: all three reads of UTF-8 dashboard files now pass encoding="utf-8", and the touched test file has the required SPDX header. This addresses the Windows default-codepage failure without changing dashboard runtime behavior.

Validation run locally on Windows:

• python -m pytest tools\wrtc-bridge-dashboard\test_bridge_dashboard.py -q -> 27 passed
• python -m py_compile tools\wrtc-bridge-dashboard\test_bridge_dashboard.py -> passed
• git diff --check origin/main...pr-4876 -> passed
• python tools\bcos_spdx_check.py --base-ref origin/main -> OK

[508704820]

Code Review: Read wRTC Dashboard Fixtures as UTF-8

Summary

Adds explicit encoding="utf-8" to open() calls in the wRTC bridge dashboard tests. Fixes potential UnicodeDecodeError on Windows systems that default to cp1252.

What Works Well

1. Explicit encoding: Prevents platform-dependent encoding issues
2. SPDX header: Added MIT license identifier
3. Low risk: Test-only change

Verdict: Approve

Good encoding practice. Python 3 best practice for cross-platform compatibility.

[loganoe]

Approved. The fixture reads now explicitly use UTF-8, which matches the dashboard files and avoids platform-default encoding failures without changing test behavior.

Validation performed:

• git diff --check origin/main...HEAD
• python3 -m py_compile tools/wrtc-bridge-dashboard/test_bridge_dashboard.py
• PYTEST_DISABLE_PLUGIN_AUTOLOAD=1 pytest -q tools/wrtc-bridge-dashboard/test_bridge_dashboard.py -> 27 passed

[jaxint]

Great contribution! LGTM.

[jaxint]

Great contribution! LGTM.