fix(ui): improve bounty card interactions and responsive issue tabs

[carlh7777]

Summary

Improves several bounty/watchlist UX interactions across desktop and mobile.

• Added click-to-copy support for truncated payout hotkeys on bounty cards, including clipboard feedback and navigation-safe interaction behavior.
• Updated bounty title tooltips to appear only when the clamped title is actually truncated.
• Improved Issue Bounties tab responsiveness on narrow/mobile widths by enabling scrollable tabs when needed while preserving balanced full-width layouts on larger screens.

Related Issues

Closes #1186

Type of Change

• Bug fix
• New feature
• Refactor
• Documentation
• Other (describe below)

Screenshots

Before

Before.webm

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After

After.webm

Checklist

• New components are modularized/separated where sensible
• Uses predefined theme (e.g. no hardcoded colors)
• Responsive/mobile checked
• Tested against the test API
• npm run format and npm run lint:fix have been run
• npm run build passes
• Screenshots included for any UI/visual changes