Feature request: per-project daily drill-down + custom date range selector

[jc370]

Hi team — love what you've built with CodeBurn. Really great visibility into AI coding costs. A few things that would make it even more useful:

Feature Requests

1. Per-project daily cost breakdown

When you have multiple active projects, it's hard to understand day-by-day spend for a single project. A way to filter/drill into one project and see its daily trend would be really valuable — especially for projects used daily over weeks.

2. Custom date range selector

The current period tabs (Today / 7 Days / 30 Days / Month / All) are great but sometimes you want to look at a specific sprint, billing period, or date range. A custom start/end date picker would close that gap.

Bug Report: Yesterday's data missing from menubar (UTC+ timezones)

Found a timezone bug in toDateString in src/cli.ts. It uses .toISOString() which returns UTC — so for anyone in a UTC+ timezone (UK, Europe, Asia), midnight local time resolves to the previous day in UTC. This shifts yesterdayStr back one day, silently dropping the most recent day from the menubar history payload.

Fix:

// Before
function toDateString(date: Date): string {
  return date.toISOString().slice(0, 10)
}

// After
function toDateString(date: Date): string {
  const y = date.getFullYear()
  const m = String(date.getMonth() + 1).padStart(2, '0')
  const d = String(date.getDate()).padStart(2, '0')
  return `${y}-${m}-${d}`
}

Happy to raise a PR for the bug fix if useful. Thanks for building this!

[jc370]

Quick clarification on the per-project drill-down request — I'm aware --project was shipped in 0.6.1 for the CLI and it works great. What I'd love is the same capability in the menubar app GUI — being able to select a project from a dropdown/filter in the popup and see that project's daily trend directly in the menubar without opening a terminal.

The menubar is where I naturally glance for a quick cost check, so having project-level visibility there (rather than switching to a terminal) would be the real win.

[lfl1337]

Hey @jc370 — good find, your toDateString fix is correct. The history payload does silently drop the most recent day for anyone east of UTC.

Please go ahead and open that PR — the fix is worth landing quickly. Happy to review or help if you hit blockers. I'm not a maintainer myself so I can't merge, but another pair of eyes tends to help things along. Feel free to ping me here, in a draft PR, or on X (linked from my GitHub profile).

Also happy to look at the two feature asks. Some related work is already sitting in feature branches on my fork (https://github.com/lfl1337/codeburn) — feel free to peek if you want; I'll upstream them as separate PRs when ready.