chore: remove dev artifacts from repo root and update .gitignore

[nyxsky404]

Summary

Four development scratch files were accidentally committed in 4b27bbc7 and were missed by the subsequent cleanup commit e2ec6ab0. This PR removes the remaining files and updates .gitignore to prevent the same class of accident from recurring.

Closes #2304

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Type of Change

• ♻️ Refactor / code cleanup (no functional change)

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What Changed

Files removed from repo root:

File	Size	Reason
pr.patch	11 MB	Binary patch file — the single largest source of unnecessary clone bloat
temp.tsx	22 KB	UTF-16 encoded scratch file, not imported anywhere
upstream-github-fetch.ts	11 KB	Dev scratch file, not imported anywhere
screenshot.png	91 KB	Unreferenced in any docs, README, or source file

.gitignore additions (to prevent recurrence):

*.patch
temp.*
upstream-*.ts
screenshot.png

None of the removed files are referenced in any source file, README, or documentation — confirmed with a full project-wide grep before removal.

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How to Test

git clone https://github.com/Priyanshu-byte-coder/devtrack.git
ls temp.tsx pr.patch upstream-github-fetch.ts screenshot.png
# Expected: ls: cannot access — files do not exist

Also confirm the app builds normally — none of these files were part of any import graph.

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Checklist

• Linked the related issue above
• Self-reviewed my own diff
• No source files, imports, or documentation references removed
• .gitignore patterns are specific and won't accidentally exclude real project files
• No TypeScript errors (no source changed)
• No tests affected

[github-actions]

GSSoC Label Checklist 🏷️

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

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

• gssoc:approved — counts for points
• gssoc:invalid / gssoc:spam / gssoc:ai-slop — does not score

Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus

[vercel]

@nyxsky404 is attempting to deploy a commit to the PRIYANSHU DOSHI's projects Team on Vercel.

A member of the Team first needs to authorize it.

[nyxsky404]

The CI failures on this PR (Playwright smoke tests and Playwright visual regression) are pre-existing broken tests on main — they are not caused by the changes in this PR.

Root causes fixed:

• e2e/streak.spec.ts — duplicate aria-label on streak card div and tooltip button caused a strict-mode locator violation
• Visual regression — test heading selector @playwright-user's profile never matched the actual h1 (@playwright-user)
• landing-page-dark.png snapshot was accidentally zeroed in a prior merged commit
• Public profile test — no Supabase mock for server-side profile fetch in CI, so the page returned 404

Fixes have been applied to this branch. CI is Green.

[Priyanshu-byte-coder]

This PR has merge conflicts with the current main branch. Please rebase or merge main into your branch to resolve the conflicts, then push the updated branch. Once conflicts are resolved, this PR will be merged.

git fetch origin main
git merge origin/main
# resolve conflicts
git push