[PM-36643] refactor: Extract premium checkout debounce interval to Constants

[KatherineInCode]

🎟️ Tracking

PM-36643

📔 Objective

Extracts the hardcoded 300 ms debounce interval in DefaultBillingService.premiumCheckoutStatusPublisher() into Constants.premiumCheckoutStatusDebounceInterval (typed as DispatchQueue.SchedulerTimeType.Stride) and wires it as the default value for the existing injectable debounceInterval parameter. Also adds line-wrapping style and magic-number constant guidance to .claude/CLAUDE.md.

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

This PR extracts the hardcoded 300 ms debounce interval in DefaultBillingService.premiumCheckoutStatusPublisher() into Constants.premiumCheckoutStatusDebounceInterval and wires it as the default for the existing injectable debounceInterval initializer parameter. It also documents the magic-number-to-Constants rule in .claude/CLAUDE.md. The change preserves behavior exactly (same value, same type), and the only production call site relies on the default while the test suite continues to inject its own faster interval.

Code Review Details

No issues found.

• Type match: parameter and constant both DispatchQueue.SchedulerTimeType.Stride.
• Value preserved: .milliseconds(300) unchanged.
• Placement: alphabetically positioned in Constants.swift between pbkdf2Iterations and premiumUpgradeBannerAccountAge.
• Module choice: PM-specific value correctly placed in the BitwardenShared Constants extension rather than BitwardenKit, consistent with the new CLAUDE.md guidance.
• Tests: BillingServiceTests injects .milliseconds(100) explicitly and is unaffected by the default change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.27%. Comparing base (d61c576) to head (cb738be).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2632      +/-   ##
==========================================
- Coverage   87.31%   86.27%   -1.04%     
==========================================
  Files        1912     2137     +225     
  Lines      170379   184896   +14517     
==========================================
+ Hits       148759   159512   +10753     
- Misses      21620    25384    +3764     

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[andrebispo5]

Missed this one, thank you!

[andrebispo5]

@KatherineInCode looks good only thing missing is fixing the PR labels 👍