Add aria-labels to all icon-only buttons across the app

[Benjtalkshow]

Several buttons across the app render only an icon with no visible text and no aria-label. Screen readers announce them as "button" with no context. Examples found during a quick pass:

• The mobile cancel button in bounty-detail-sidebar-cta.tsx (X icon next to Apply)
• Action icons in model4-maintainer-dashboard.tsx (Message, Remove)
• The copy link button under the sidebar CTA
• The mode toggle in components/mode-toggle.tsx
• Action buttons in application-review-dashboard.tsx

What to do

Walk every icon-only button in components/ and add an appropriate aria-label. Where the button already has a Tooltip with TooltipContent, use that text as the aria-label to keep them in sync.

The notification bell and bookmark button already do this correctly. Use them as the reference pattern.

Acceptance criteria

• Every icon-only button has a meaningful aria-label
• Tooltip text and aria-label match where both exist
• Existing buttons with text labels are unchanged
• No new accessibility regressions reported by axe on the bounty detail page

Files

• components/bounty-detail/bounty-detail-sidebar-cta.tsx
• components/bounty-detail/model4-maintainer-dashboard.tsx
• components/bounty/application-review-dashboard.tsx
• components/mode-toggle.tsx
• components/notifications/notification-bell.tsx (reference)
• components/bounty/bookmark-button.tsx (reference)
• Plus any other icon-only buttons discovered during the sweep

[linear]

BOU-241

[coderabbitai]

🔗 Related PRs

#88 - feat: Implement bounties detail page [merged]
#93 - Fix lint [merged]

---

📝 Issue Planner

_{Check the box below or use the @coderabbitai plan command to generate an implementation plan and prompts that you can use with your favorite coding assistant.}

• Create Plan

---

🧪 Issue enrichment is currently in open beta.

You can configure auto-planning by selecting labels in the issue_enrichment configuration.

To disable automatic issue enrichment, add the following to your .coderabbit.yaml:

issue_enrichment:
  auto_enrich:
    enabled: false

💬 Have feedback or questions? Drop into our discord!

[MarcusDavidG]

@MarcusDavidG has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I can handle this issue and will like to work on it, Please assign thank you.

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

[Biokes]

@Biokes has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi maintainer,
I will like to work on this issue.

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

[idrisososanwo]

@idrisososanwo has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I’m a smart contract and full-stack developer who turns complex ideas into secure, production-ready blockchain code.
With strong skills in Rust and Solidity, I build systems that are fast, safe, and built to last.

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

[superstarflayce]

@superstarflayce has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

i would like to work on this issue

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

[1sraeliteX]

@1sraeliteX has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I would like to work on this issue because i can handle it effectively and on time

ℹ️ Repo Maintainers: To accept this application, review their application or assign @1sraeliteX to this issue.