fix(ui): escape Markdown special characters in tooltip user values

[nullvariant]

Summary

• Add escapeMarkdownInline() pure function in markdownEscape.ts to escape Markdown special characters (\, *, _, `, [, ], <, >, |) and sanitize newlines (\n → space, \r → removed)
• Apply to all user-supplied values in buildTooltip() (identity name, description, email, SSH host, SSH key, GPG key) and buildMismatchTooltip() (expected/actual mismatch values)
• Add 15 unit tests covering each character class, edge cases (empty string, combined chars, backslash+pipe), and newline handling
• Add 1 E2E test verifying pipe escape in mismatch tooltip table

Test plan

• npx tsc --noEmit passes
• ESLint passes (0 errors)
• Unit tests pass (npm run test)
• Coverage maintained at 100% (markdownEscape.ts: 100% all metrics)
• Mechanical validation script passes
• E2E tests pass in CI

🤖 Generated with Claude Code

[nullvariant-mimi]

🐰 Mimi's Validation Report ✅

All checks are looking good! Great job! 🎉

⏳ Some checks are still running. I will keep watching!

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バリデーターを通してくださいね

This report was carefully prepared by nullvariant-mimi[bot]

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Snapshot Warnings

⚠️: No snapshots were found for the head SHA 7d9c6b6.

Ensure that dependencies are being submitted on PR branches and consider enabling retry-on-snapshot-warnings. See the documentation for more information and troubleshooting advice.

Scanned Files

None

[nullvariant-slow]

🦥 Slow's Code Review 😩

...yawn... Do I really have to review this?

⚠️ TOO LONG... I can barely keep my eyes open reading these:

File	Lines

| extensions/git-id-switcher/src/test/e2e/statusBar.test.ts | 581 |

Split it up... reading long files is exhausting.

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働きたくないでござる

This review was reluctantly filed by nullvariant-slow[bot]

[nullvariant-ciel]

🕊️ Ciel's Mediation 🌤️

*~~ floating down from the clouds ~~ The zoo seems a bit noisy today...*

2 zoo members have reviewed this PR.

Zoo Member	Status
🦥 Slow	Commented
🐰 Mimi	Commented

⚖️ The zoo has mixed opinions. Some are concerned, some are fine with it. Please review each comment carefully and make the final call.

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まあまあ、ほどほどに。

This mediation was peacefully delivered by nullvariant-ciel[bot]

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!