fix: restore prior body overflow when ProfileQrModal unmounts

[nyxsky404]

User description

Summary

• Follow-up from fix(dashboard): fetch real commit activity from weekly-summary API instead of hardcoded data #3362: ProfileQrModal currently restores document.body.style.overflow to "" on unmount, which clobbers any inline overflow that was set before the modal opened.
• Capture the previous value and restore it, matching the pattern already used in RepoAnalyticsSheet.

Test plan

• pnpm exec vitest run test/components/ProfileQrModal.test.tsx
• Open the profile QR modal, close it, and confirm background scroll returns to whatever it was before (including if another overlay had already locked it)

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CodeAnt-AI Description

Restore the page’s previous scroll setting after closing the profile QR modal

What Changed

• The modal still prevents background scrolling while open
• Closing or unmounting the modal now restores the scroll setting that was active before it opened, instead of clearing it
• Tests verify that an existing overflow setting is preserved

Impact

✅ Preserved background scroll behavior with stacked overlays
✅ Fewer unexpected page scroll changes after closing the modal

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[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

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[codeant-ai]

🤖 CodeAnt AI — Review Status

Status	Commit	Started (UTC)	Finished (UTC)
✅ Reviewed your PR	e84978d	Aug 17, 2026 · 17:15	17:17

[Priyanshu-byte-coder]

Exactly the follow-up I asked for, and you did the part that makes it real: the test now sets document.body.style.overflow = "scroll" before mounting and asserts it comes back, so the behaviour is actually pinned rather than just described. Capturing the previous value beats hardcoding "", which clobbered whatever was there before the modal opened.

Verified against current main: merges clean, type-check clean, all 8 ProfileQrModal tests pass.

The Analyze (javascript-typescript) failure was not your code — CodeQL hit a GitHub-side outage on 17 Aug (No server is currently available to service your request, thrown from the init action before it could even produce debugging artifacts). I re-ran the job and it passes.

Merged. Thanks for splitting it out cleanly.

[github-actions]

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