🐛 Fix screenshot success screen and add paste support in FeatureRequestModal

[clubanderson]

Summary

• Replace stale amber "paste your screenshots into GitHub" banner on success screen with green "screenshots uploaded" confirmation (matching FeedbackModal.tsx)
• Add handlePaste + onPaste={handlePaste} on textarea for Ctrl+V screenshot capture (was missing — already worked in FeedbackModal)

Closes #3519

Test plan

• Submit a feature request with a screenshot attached — verify green confirmation appears (not amber "paste" banner)
• Verify screenshot appears in the created GitHub issue (tested with alphabet image → Screenshot upload test - verify alphabet image appears in GitHub issue #4053)
• Build passes

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Pull request overview

This PR updates the FeatureRequestModal UX to correctly reflect that screenshots are automatically uploaded/attached to the created GitHub issue, and adds missing paste-to-attach support so Ctrl+V screenshots are captured consistently (matching FeedbackModal behavior).

Changes:

• Added a handlePaste handler and wired onPaste on the request textarea to capture pasted images as screenshots.
• Replaced the stale amber “paste your screenshots into GitHub” success-screen banner with a green “screenshots uploaded and attached” confirmation.