chore: markdown composer improvements

[Rohit3523]

Proposed changes

1. if i send any markdown message using tooltip and try to use the tooltip again, cursor will show next to 2nd symbol
2. improve the codeblock markdown, the correct format is "```\ntext\n```" not "```text```"

Issue(s)

How to test or reproduce

Screenshots

1. iOS markdown composer fixed
   Before: https://github.com/user-attachments/assets/d3c42401-81a3-4061-ad61-b5bd6f32ce5f
   After: https://github.com/user-attachments/assets/21302028-4aeb-4a3e-8b22-6fde7860b113

2. Codeblock markdown fix

OS	Before	After
Android	https://github.com/user-attachments/assets/aa71bc32-b1ac-491f-bfa1-cb77408a5170	https://github.com/user-attachments/assets/78f9151e-e3a8-4b8d-af38-005596d330f2
iOS	https://github.com/user-attachments/assets/d9819da2-d46d-45dc-9fee-09e84908b8b8	https://github.com/user-attachments/assets/2a233dc8-2f9b-4d95-ba1b-7eba63a44027

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves a current function)
• New feature (non-breaking change which adds functionality)
• Documentation update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• I have added necessary documentation (if applicable)
• Any dependent changes have been merged and published in downstream modules

Further comments

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch markdown-improve

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[github-actions]

Android Build Available

Rocket.Chat Experimental 4.67.0.107715

Internal App Sharing: https://play.google.com/apps/test/RQVpXLytHNc/ahAO29uNRNkIEkT6j4eIJftZ7n4A7P15Sxwb5htIWHWgIMFDj_tdvLkc-4RP-FuZXqZbP7sGwdJtt4L4JOkPBkA7nQ

[github-actions]

iOS Build Available

Rocket.Chat Experimental 4.67.0.107716

[github-actions]

iOS Build Available

Rocket.Chat 4.67.0.107714

[Rohit3523]

Requesting an early review

[github-actions]

iOS Build Available

Rocket.Chat Experimental 4.68.0.107764