feat(sharing): polish usage cards and add a 30-day range

[ericjypark]

Usage cards now offer Last 30 days, including today and the previous 29 local dates, in place of This month. On September 10, the card covers August 12–September 10. The range handles daylight saving time and loads previous-year records when needed in January. Open cards refresh that extended history as new cost scans complete.

The card studio uses clearer controls, empty states, and export feedback. Cards give the API amount more space, align provider values, simplify activity labels, and identify estimates as distinct from bills. Headings, captions, help text, and English/Chinese documentation follow the selected period. The cumulative chart design is unchanged.

Validation:

• Full Swift regression suite: bash scripts/run-tests.sh.
• Universal macOS build and startup smoke test: CODEXISLAND_DEMO=1 ./scripts/verify.sh.
• 135 usage-card assertions, including 30-day boundaries, midnight rollover, leap years, daylight saving time, and January history loading.
• 48 PNG renders across formats, metrics, and color tiers; image/caption export and PNG/TIFF clipboard checks.
• Verified the running macOS card with Last 30 days, the matching date range, and the original cumulative chart.

Summary by CodeRabbit

• New Features

  • Replaced the calendar-month usage period with a rolling Last 30 days range.
  • Added clearer usage-card labels, descriptions, and API-rate disclaimers.
  • Improved weekly usage cards with updated metrics, demo date labeling, compact layouts, and refined sharing text.
  • Extended usage history loading for longer reporting periods.

• Documentation

  • Updated English and Simplified Chinese documentation to describe the new time ranges.

• Bug Fixes

  • Improved date-range accuracy across month boundaries, leap years, daylight-saving changes, and year transitions.

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Reviewing files that changed from the base of the PR and between 6a6f692 and a33929f.

📒 Files selected for processing (1)

• Sources/Sharing/WeeklyCardStudio.swift

🚧 Files skipped from review as they are similar to previous changes (1)

• Sources/Sharing/WeeklyCardStudio.swift

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📝 Walkthrough

Walkthrough

The sharing cards replace the calendar-month option with a rolling 30-day period. Snapshot text, card layout, studio behavior, localization, documentation, and tests now reflect the updated period and API-rate presentation.

Changes

Usage sharing updates

Layer / File(s)	Summary
Rolling period model and validation Sources/Sharing/WeeklyUsageSnapshot.swift, Tests/WeeklyUsageSnapshotTests.swift, Tests/WeeklyCardRenderHarness.swift, README*	The period uses today plus the previous 29 days. Labels, share text, history behavior, documentation, and boundary tests now use the rolling period.
Card layout and metric presentation Sources/Sharing/WeeklyUsageCard.swift	The card adds demo and API-rate messaging, compact sizing, revised labels, constrained provider rows, and updated milestone seal dimensions.
Studio behavior and localized copy Sources/Sharing/WeeklyCardStudio.swift, Resources/en.lproj/Localizable.strings, Resources/zh-Hans.lproj/Localizable.strings	The studio reloads full history after updates and uses revised controls, empty states, status messages, and translations.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to a3392

No current merge-blocking risk was identified.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 9 functions across 5 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main changes: usage-card polish and replacement of the monthly range with a 30-day range.

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[chatgpt-codex-connector]

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Actionable comments posted: 1

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Inline comments:
In `@Sources/Sharing/WeeklyCardStudio.swift`:
- Line 87: Update the store-update handler containing usesFullHistory and
history.loadIfNeeded() to call history.refresh() when full history is enabled,
ensuring populated history.buckets are refreshed after store.lastUpdated
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ℹ️ Review info

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Configuration used: defaults

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📥 Commits

Reviewing files that changed from the base of the PR and between 597bf41 and 6a6f692.

📒 Files selected for processing (9)

• README.md
• README.zh-CN.md
• Resources/en.lproj/Localizable.strings
• Resources/zh-Hans.lproj/Localizable.strings
• Sources/Sharing/WeeklyCardStudio.swift
• Sources/Sharing/WeeklyUsageCard.swift
• Sources/Sharing/WeeklyUsageSnapshot.swift
• Tests/WeeklyCardRenderHarness.swift
• Tests/WeeklyUsageSnapshotTests.swift

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