Logbox selectable error text

[martior]

Summary

Makes error text in LogBox selectable and adds a "Copy" button to
easily copy the full error to clipboard.

Changes:

• Added selectable={true} to Text components that display error
  messages, stack frames, and code frames in LogBox
• Added a "Copy" button in the error message header that copies the
  full error (title, message, and stack trace) as plain text

Changelog

[General][Added] - LogBox error text is now selectable and includes a
Copy button to copy the full error with stack trace

Test Plan

1. Trigger an error in a React Native app to open LogBox
2. Verify you can long-press and select text in:
   - The error message
   - The stack frame method names and file locations
   - The code frame source preview
3. Tap the "Copy" button next to the error title
4. Paste in a text editor and verify it contains:
   - The error title (e.g., "Console Error")
   - The error message
   - The full stack trace formatted as:

Console Error

Error message here...

at methodName (file.js:10:5)
at anotherMethod (other.js:20:3)

[meta-cla]

Hi @martior!

Thank you for your pull request and welcome to our community.

Action Required

In order to merge any pull request (code, docs, etc.), we require contributors to sign our Contributor License Agreement, and we don't seem to have one on file for you.

Process

In order for us to review and merge your suggested changes, please sign at https://code.facebook.com/cla. If you are contributing on behalf of someone else (eg your employer), the individual CLA may not be sufficient and your employer may need to sign the corporate CLA.

Once the CLA is signed, our tooling will perform checks and validations. Afterwards, the pull request will be tagged with CLA signed. The tagging process may take up to 1 hour after signing. Please give it that time before contacting us about it.

If you have received this in error or have any questions, please contact us at [email protected]. Thanks!

[meta-cla]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!