fix: correct TuiStats size comment, revert cost_cents to u32

[Sewer56]

Summary

• Updates the outdated comment (24 → 40 bytes)
• Reverts cost_cents from u64 back to u32, saving 8 bytes

Fixes comment oversight from #130.

Details

TuiStats is now 40 bytes instead of 48 bytes. While TuiStats does aggregate totals per session/day, a u32 for cost_cents supports up to $43M per day - far beyond realistic usage. For comparison: the user from #129 spent $177K over 3 months.

Ref: #129 (comment)

Summary by CodeRabbit

Release Notes

• Refactor
  • Optimized internal cost calculation and storage to improve memory efficiency while maintaining consistent cost tracking functionality.

[coderabbitai]

📝 Walkthrough

Walkthrough

The cost_cents field in the TuiStats struct was changed from u64 to u32, reducing the stored numeric type. All related conversions, method implementations, and field assignments were updated across three files to use the new type while maintaining calculation correctness through explicit casting where needed.

Changes

Cohort / File(s)	Summary
Core Type Definition src/types.rs	Updated TuiStats struct with cost_cents field changed from u64 to u32. All related methods (set_cost, add_cost, From<&Stats> implementation, AddAssign, SubAssign) updated to cast and use u32 for cost operations.
Conversion and Casting src/contribution_cache/single_message.rs	Adjusted cast in PackedStatsDate::to_tui_stats conversion from u64 to u32 to align with updated TuiStats.cost_cents type.
TUI Rendering Logic src/tui.rs	Changed best_cost_cents local variable from u64 to u32 in draw_daily_stats_table. Added explicit u64 casts during cost accumulation in three functions to handle aggregation with the new smaller field type.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Fix capped large token totals in TUI stats #130: Directly related change modifying the same TuiStats.cost_cents field but widening it to u64, representing an opposing type adjustment.

Poem

🐰 A rabbit hops through memory lanes,
Where bytes once danced in sixty-fours,
Now thirty-twos claim lesser reigns,
The struct grows lighter than before—
Optimization bounds in spacious bounds! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and accurately summarizes the main changes: correcting a size comment and reverting cost_cents to u32, matching the primary objectives of the PR.
Docstring Coverage	✅ Passed	Docstring coverage is 87.50% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

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📝 Coding Plan

• Generate coding plan for human review comments

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[coderabbitai]

Actionable comments posted: 1

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: aac344ca-504a-424a-9dff-92179a7bd20b

📥 Commits

Reviewing files that changed from the base of the PR and between 730b9bd and c307ac8.

📒 Files selected for processing (3)

• src/contribution_cache/single_message.rs
• src/tui.rs
• src/types.rs