Add downloadable PDF report for user survey responses

[Zaiidmo]

✨ Summary

This PR introduces a new feature allowing users to download a polished,
branded PDF report containing their survey responses.
The report is generated client-side using pdf-lib, includes a modern
developer-friendly layout, and reflects the StateOfDev / GeeksBlaBla branding.

This closes a long-requested UX gap by giving respondents a personal,
shareable copy of their answers.

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📄 Key Features

1. New /my-responses page

• Loads authenticated user answers from Firestore.
• Displays answers in a clean UI for on-screen review.
• Provides a Download my report (PDF) action.

2. Fully custom PDF generator

Built with pdf-lib (no server required), including:

🎨 Layout & Styling

• Tech-themed layout combining terminal + modern report aesthetics.
• Custom header with StateOfDev and GeeksBlaBla logos.
• Centered title, lighter subtitle, and subtle underline.
• Metadata “card” with submission details.
• Each section has its own visual block with:
  • Blue section header bar
  • Question → Answer pairs
  • Thin dividers for readability

🖼 Assets

• Logos embedded directly into the PDF.
• Footer on every page with:
  • StateOfDev.ma · GeeksBlaBla signature (center)
  • Page numbering (right)

🔧 Utilities

• sanitizeForPdf() to safely remove unsupported glyphs (emojis, exotic chars).
• wrapText() for accurate line wrapping using font metrics.

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🧪 Tests

A full test suite was added covering:

• sanitizeForPdf
• wrapText
• PDF generation “smoke test”
• DOM + URL mocks to ensure proper download behavior

All tests pass.

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🔍 Lint & Type Safety

• Resolved all TypeScript + ESLint issues.
• No remaining warnings in the new files.
• Test environment stubs fixed to avoid ts/unbound-method and no-unsafe-*.

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🧭 How to Use

1. Complete the survey normally.
2. After the “Thanks” page, click View & Download My Report.
3. The /my-responses page displays your answers.
4. Click Download my report (PDF) → generates a branded PDF file.

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📸 Preview (Structure Overview)

Here are some screenshots of the entire functionality from the Thanks page to the first page of the generated doc

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🚀 Why This Matters

This feature significantly improves survey UX by:

• Giving participants something tangible and professional.
• Reinforcing community engagement.
• Increasing trust and transparency.
• Creating a shareable artifact for career/portfolio use.

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✔ Ready for Review

Feedback welcome!
Happy to adjust layout, spacing, copy, or branding as needed.