Fix TLS Decoder

[spring1843]

• Fix cert decoder to use real decoder rather than mock data

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[Copilot]

Pull request overview

This PR replaces the TLS Decoder tool’s mock certificate parsing with real X.509 parsing via @peculiar/x509, updates the bundled default certificate example, and adjusts E2E assertions to account for CodeMirror rendering only visible lines.

Changes:

• Implement real certificate parsing, extension rendering, fingerprints, and SAN listing in the TLS Decoder UI.
• Replace the TLS decoder default certificate with a real-world example PEM.
• Update TLS Decoder E2E tests to validate only the visible (initial) portion of the default certificate.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
client/src/pages/tools/tls-decoder.tsx	Switches from mock parsing to real X.509 decoding and renders detailed extension/fingerprint/SAN info.
client/src/data/defaults.ts	Updates the default TLS decoder PEM example.
tests/e2e/tools/tls-decoder.spec.ts	Adjusts default-input checks to match CodeMirror’s visible-line rendering behavior.
package.json	Adds @peculiar/x509 and reflect-metadata dependencies needed for real parsing.
package-lock.json	Locks new dependency tree for X.509 parsing support.