test: add unit tests for digest_service.py pure HTML helpers (#1478)

[duongynhi000005-oss]

Summary

Fixes #1478

Adds backend/tests/test_digest_service_helpers.py with comprehensive unit tests for the two pure HTML rendering helpers in backend/services/digest_service.py:

_build_team_performance_html (10 tests)

• Empty list returns 'no data' paragraph (no table)
• Single team returns proper table with data row
• High resolution rate (≥80%) uses green (#059669)
• Medium resolution rate (50-79%) uses amber (#d97706)
• Low resolution rate (<50%) uses red (#dc2626)
• SLA breaches > 0 uses red (#dc2626)
• Zero SLA breaches uses gray (#6b7280)
• Multiple teams all appear in output
• Proper table HTML structure with all column headers
• Missing keys use sensible defaults (0%, N/A)

_build_category_list_html (5 tests)

• Empty list returns 'no data' paragraph
• Single category with name and count
• Multiple categories all appear
• Uses flexbox layout
• Returns string type

All tests are pure (no mocking needed) since these are pure HTML builder functions.

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[ritesh-1918]

Hi @duongynhi000005-oss! 🙌

Thank you so much for your excellent contribution: "test: add unit tests for digest_service.py pure HTML helpers (#1478)"! We really appreciate the high-quality code and effort you have put into the platform.

Just a quick, friendly heads-up as we prepare our manual merging and verification queues—please make sure to complete all the mandatory community steps listed below.

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Once those manual steps are verified, we'll get your PR officially merged into the gssoc branch (or keep it neatly cataloged if closed as integrated) and assign it the highest possible GSSoC S-Tier labels to maximize your leaderboard points!

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[ritesh-1918]

Merged locally into gssoc branch. Thank you for your GSSoC contribution! 🚀🔥