Add test coverage for safety/emoji.py

[userjuma]

Description

safety/emoji.py had no test coverage at all — three pure functions (process_custom_emojis, process_rich_emojis_fallback, load_emoji) handling the custom :icon_*: namespace and ASCII fallbacks for environments that can't render emoji, with zero tests exercising any of it. Added a full test suite for the module.

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor
• Other (please describe): Test coverage addition

Related Issues

Related to #573

Testing

• Tests added or updated
• No tests required

Added tests/test_emoji.py with 14 tests covering: known icon/emoji codes replaced correctly (both unicode and ASCII fallback paths), unknown codes left untouched rather than stripped or mis-replaced, non-string input handled gracefully, multiple codes in one string, and the load_emoji() branching behavior specifically — Rich emoji codes are only touched when use_ascii=True, verified that stays true rather than assumed.

Ran the full suite (pytest -q): 885 passed, 14 skipped, 1 pre-existing unrelated flake in tests/auth/test_status.py (a timing assertion, duration_ms > 0, unrelated to this change).

Checklist

• Code is well-documented
• Changelog is updated (if needed)
• No sensitive information (e.g., keys, credentials) is included in the code
• All PR feedback is addressed

Additional Notes

Picked this up via the general test-coverage issue (#573), which asks contributors to find an untested area and link back — emoji.py had no matching test file in tests/.

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