Frontend dark-mode pass on dashboard charts

[kilodesodiq-arch]

Problem Statement. Field reports suggest low-brightness environments make the
default dashboard unusable.

Technical Context.
next-themes is in dependencies.

Expected Outcome. Dark mode handles charts (Recharts or native SVG) gracefully;
contrast ratio meets WCAG AA.

Acceptance Criteria.

• A Playwright test toggles theme and asserts no chart uses currentColor blindly.

Files or modules likely to be affected.
app/frontend/src/components/charts/* (assumed).

Difficulty. Easy
Estimated effort. S

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Mobile (Expo/RN) — Issues 89–93

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Backlog item #88 from `docs/maintainer-issue-backlog.md.

[Heazzy500]

Hi, I’d appreciate the opportunity to contribute to this issue. I’m detail-oriented and committed to delivering quality work.

[Ayinkx1]

Hi i would like to work on this issue please assign to me
I can do it perfectly

[dominiccreates]

I would like to work on this issue because i am confident i can resolve the issue, having worked on and resolved similar issues. my eta is 4 hours

[grantfox-oss]

🦊 GrantFox — @dominiccreates has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #296)
2. Your PR will be reviewed by the ChainForgee maintainers

Good luck! Track your progress on GrantFox.