fix: restore hidden shell footer hint

[jonathanperis]

Summary

• Restores the footer hint for the hidden shell Konami-code easter egg.
• Keeps the visible hero Open shell button removed.

Test Plan

• mise exec -- bun run lint
• mise exec -- bun run build
• git diff --check

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 3b5b15ff-62c2-483e-9307-921ede0d82bd

📥 Commits

Reviewing files that changed from the base of the PR and between ca57add and 661c9a0.

📒 Files selected for processing (1)

• src/components/Portfolio.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/restore-shell-hint

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[jonathanperis]

User requested restoring this exact footer hint. Non-bot gates are green: build, analyze, CodeQL; local Astro lint/build and diff check passed; no inline review comments. Proceeding with rebase merge despite CodeRabbit rate-limit-only comment.