[0.60.5] Port usage spend sharing semantics

[Finesssee]

What changed

The Windows Usage & Spend share/export path now carries the last included reporting day and the dashboard timezone from the Rust usage summary. Shared PNGs and JSON filenames use that stable reporting day, and the share footer uses the correct singular/plural subscription caption.

Scope

• Adds only the minimal Usage Spend DTO fields and timezone export needed by the active Windows share path.
• Keeps the implementation independent of dashboard usage-bar behavior and the existing v0.60.5 port PRs.

Validation

• cargo fmt --all -- --check
• git diff --check
• Focused Vitest file added at apps/desktop-tauri/src/lib/usageSpendSharing.test.ts; the worktree has no frontend dependency cache, so running it would require an install and was intentionally not performed to protect local storage.

Summary by CodeRabbit

• New Features

  • Usage spend summaries now include the reporting day and dashboard timezone.
  • Shared usage spend images include a reporting-period footer with subscription counts.
  • PNG and JSON export filenames now use the report’s reporting day.
  • Reporting dates are formatted consistently across time zones and locales.
  • Subscription captions now use correct singular and plural wording.

• Bug Fixes

  • Corrected reporting-day handling to preserve the intended calendar date across time zones.

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📥 Commits

Reviewing files that changed from the base of the PR and between c802f43 and 168e29f.

📒 Files selected for processing (2)

• apps/desktop-tauri/src/lib/usageSpendSharing.test.ts
• apps/desktop-tauri/src/lib/usageSpendSharing.ts

🚧 Files skipped from review as they are similar to previous changes (2)

• apps/desktop-tauri/src/lib/usageSpendSharing.test.ts
• apps/desktop-tauri/src/lib/usageSpendSharing.ts

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📝 Walkthrough

Walkthrough

The usage-spend summary now includes the reporting day and dashboard timezone. Sharing utilities validate and format this metadata. Share images include a footer, and PNG and JSON filenames use the reporting day.

Changes

Usage spend reporting

Layer / File(s)	Summary
Reporting metadata contract apps/desktop-tauri/src-tauri/src/commands/usage_spend.rs, apps/desktop-tauri/src/types/bridge.ts, rust/src/core/mod.rs, rust/src/core/timezone.rs	The backend derives the latest included reporting day and local dashboard timezone. The bridge exposes both fields. The timezone helper is publicly exported.
Localized sharing helpers apps/desktop-tauri/src/lib/usageSpendSharing.ts, apps/desktop-tauri/src/lib/usageSpendSharing.test.ts	The helpers validate and format reporting dates, preserve civil days across timezones, generate subscription captions, and build share footers. Tests cover these behaviors.
Share image and export integration apps/desktop-tauri/src/surfaces/settings/tabs/UsageSpendTab.tsx	Share images include the reporting footer and increased height. PNG and JSON filenames use summary.reportingDay.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant build_usage_spend_summary
  participant UsageSpendTab
  participant usageSpendShareFooter
  build_usage_spend_summary->>UsageSpendTab: provide reportingDay and dashboardTimezone
  UsageSpendTab->>usageSpendShareFooter: build usage-spend footer
  usageSpendShareFooter-->>UsageSpendTab: return formatted footer
  UsageSpendTab->>UsageSpendTab: add footer and use reportingDay in filenames

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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 7 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the version and the primary change: porting usage spend sharing semantics. It is concise and directly related to the pull request objectives.
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.

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
In `@apps/desktop-tauri/src/lib/usageSpendSharing.ts`:
- Around line 13-81: Update formatUsageSpendReportingDay to validate
dashboardTimezone with partsInTimeZone, then format the validated civil date
target in UTC rather than applying the corrected instant through the dashboard
timezone. Preserve the existing fallback to reportingDay for invalid dates or
timezone errors and keep the locale-based formatting options.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 84124513-6b84-425a-802a-356389e3b2a9

📥 Commits

Reviewing files that changed from the base of the PR and between 10e3b09 and c802f43.

📒 Files selected for processing (7)

• apps/desktop-tauri/src-tauri/src/commands/usage_spend.rs
• apps/desktop-tauri/src/lib/usageSpendSharing.test.ts
• apps/desktop-tauri/src/lib/usageSpendSharing.ts
• apps/desktop-tauri/src/surfaces/settings/tabs/UsageSpendTab.tsx
• apps/desktop-tauri/src/types/bridge.ts
• rust/src/core/mod.rs
• rust/src/core/timezone.rs

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