Test markdown helper coverage

[ktsaou]

Summary

• Add behavior coverage for Markdown template helper functions and value conversion helpers.
• Cover numeric formatting, relative-time buckets, status labels/leads, bars, truncation, inline template errors, and template store directory reporting.
• Keep production code unchanged.

Quality impact

• pkg/markdown coverage: 70.8% -> 79.3%.
• Root coverage: 73.8% -> 74.0%.
• Production large functions remain at 0.

Validation

• go test ./pkg/markdown
• go test -count=1 -coverprofile=/tmp/update-ipsets-markdown-slice30.cover -covermode=atomic ./pkg/markdown
• go run ./tools/archposture -root . > /tmp/update-ipsets-archposture-slice30.json
• make lint
• make staticcheck
• make golangci-lint
• CI=true make coverage
• make test-strict
• git diff --check

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Metrics 49 complexity · 5 duplication

Metric	Results
Complexity	49
Duplication	5

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AI Reviewer: first review requested successfully. AI can make mistakes. Always validate suggestions.

_{TIP This summary will be updated as you push new changes.}