DS-074: Add accessible chart summaries and data-table fallback

[IbrahimIjai]

Context

The candlestick chart is visual and canvas-based, so screen-reader users cannot
discover its time range, trend, latest value, or underlying sampled data.

Scope

• Add a concise accessible summary linked to the chart.
• Provide an optional keyboard-reachable table of representative OHLC data.
• Announce live-price updates at a non-disruptive, throttled cadence.
• Document which chart decorations should be hidden from assistive technology.

Acceptance criteria

• The chart has an accessible name, description, time range, and latest value.
• Data fallback uses semantic table headers and chronological rows.
• Live updates do not announce every tick.
• Loading, empty, and error chart states have equivalent text.
• Tests cover summary content, table semantics, and announcement throttling.

Out of scope

• Replacing Lightweight Charts.
• Exposing every candle for very large datasets without pagination.

[Aj-Kayvee]

@Aj-Kayvee has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi, please I would love to resolve this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Aj-Kayvee to this issue.

[Vivian-04]

@Vivian-04 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hiiiiiiiiii, I would love to work on thissssssss for youuu! I have experience building accessible React applications, and I can improve the chart experience by adding accessible summaries, a keyboard-friendly data table fallback, throttled live announcements, and comprehensive tests while keeping the existing chart library intact.

Thank you for the consideration.....Thank youuuuuuu

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Vivian-04 to this issue.

[JSE19]

@JSE19 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi maintainer, I can resolve this, please let me

ℹ️ Repo Maintainers: To accept this application, review their application or assign @JSE19 to this issue.

[drips-wave]

Congratulations, @JSE19! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @JSE19: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@JSE19's PR #507 was approved and merged by @IbrahimIjai.

🏆 @JSE19: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (554 total points). Track your full progress on GrantFox.

👏 Great work, @JSE19! Keep contributing to SO4-Markets.

[drips-wave]

This issue has been completed by @JSE19 as part of the Stellar Wave Program's 7th Wave 🥳

😎 @JSE19: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

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