fix: user settings PATCH treats null body values as field omission

[tmdeveloper007]

fix: user settings PATCH treats null body values as field omission

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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

[Priyanshu-byte-coder]

Two issues:

1. Missing EOF newline on e2e/landing.spec.js.

2. Null allowed into boolean field: Changing guards from typeof is_public === 'boolean' to is_public !== undefined allows { is_public: null } through — null will be assigned to a typed boolean column. Change to is_public !== undefined && is_public !== null to properly handle field omission vs explicit null.

[Priyanshu-byte-coder]

Three issues block this merge:

1. !== undefined check is too permissive
Changing typeof is_public === "boolean" to is_public !== undefined means is_public: null or is_public: 1 would pass through and be written to the DB. The strict typeof === "boolean" check is intentional — please revert those changes.

Same problem with pinned_repos: replacing Array.isArray() with !== undefined means a string value like pinned_repos: "foo" would pass the if (pinned_repos !== undefined) check, and then pinned_repos.length would measure string length instead of array length.

2. Merge conflict
This PR conflicts with current main (settings/route.ts was updated by a recently merged PR). Please rebase on main.

3. Missing EOF newline in e2e/landing.spec.js
The diff shows the trailing newline removed. Please restore it.

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[tmdeveloper007]

This pull request is fully up-to-date with the latest upstream merges, all review items are addressed, local tests are passing cleanly, and it is fully ready to be merged! 🚀