feat: support multi-line secrets

[rohan-chaturvedi]

🔍 Overview

Adds support for multi-line secrets like PGP keys, certs, etc.

Fixes #642

💡 Proposed Changes

• Updated the secret editor UI to support multi-line secrets
• Updated the import parser to detect and import multi-line secrets
• Moved the comment button beside the secret key, and display a comment if available as the button label

🖼️ Screenshots or Demo

Screencast.From.2025-08-14.15-24-44.mp4

🎯 Reviewer Focus

• Test adding / updating both single and multi-line secrets on the single and cross env screens
• Test imports of single and multi-line secrets on the single and cross-env screens
• Test compatibility for multi-line secrets with the CLI

💚 Did You...

• Ensure linting passes (code style checks)?
  - [ ] Update dependencies and lockfiles (if required)
  - [ ] Update migrations (if required)
  - [ ] Regenerate graphql schema and types (if required)
• Verify the app builds locally?
• Manually test the changes on different browsers/devices?

[nimish-ks]

@rohan-chaturvedi Awesome work!

Notes from the PR demo:

• Pressing Tab from the secret key field should move focus to the value field (not comment button)
• Accommodate the secret tag and comment buttons / indicators in a more compact way on smaller screens. A long comment should never overlap and obstruct a secret key.
• Lets always make room for the secret key, on narrower screens maybe collapse the tag and comment buttons to just simple icon indicators 🏷️ and #️⃣. Color the icons to indicate an attached tag or a comment.

[nimish-ks]

@cursor review

[cursor]

✅ Bugbot reviewed your changes and found no bugs!

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