feat: add show hide functionality

[mustafa-sayyed]

Closes issue: #3725

📜 Summary of changes:

• Added Show/Hide functionality for sensitive fields
• Used CodeMirror's Replace Decorations to implement this functionality

🎥 Demo Video:

https://github.com/user-attachments/assets/899ae5a8-b74e-41bb-83cb-ec3c16690a15

✅ Checklist:

• [x] Make sure linting and unit tests pass.
• [x] No install/build warnings introduced.
• [x] Verified UI in browser.
• [ ] For UI changes, added/updated analytics events (if applicable).
• [ ] For changes in extension's code, manually tested in Chrome and Firefox.
• [ ] Added/updated unit tests for this change.
• [ ] Raised pull request to update corresponding documentation (if already exists).
• [x] Added demo video showing the changes in action (if applicable).

🧪 Test instructions:

• Open the Authorization Tab in API Client
• Choose an Authorization Type ( API Key, Bearer Token, Basic Auth )
• Then You can Test Show/Hide functionality

Summary by CodeRabbit

• New Features

  • Authorization inputs (API keys, bearer tokens, passwords) are now marked as secrets and masked by default.
  • Added an eye toggle to reveal/hide sensitive values on demand.
  • Editor now renders concealed characters as bullets when masking is enabled.

• Style

  • Added styling for the visibility toggle to ensure proper positioning and interaction.

_{✏️ Tip: You can customize this high-level summary in your review settings.}