fix: thread title summarization doesn't work well on reasoning models

[louis-menlo]

Describe Your Changes

This PR resolved the issue where thread titles weren't being generated for threads using reasoning models.

1. Summarization title shouldn't break when encountering a line break
2. Exclude thought section

Changes

This pull request includes several changes to the ModelHandler function in the web/containers/Providers/ModelHandler.tsx file. The changes focus on improving the handling and cleaning of message content before updating the thread title.

Improvements to message content handling:

• Changed messageContent from const to let to allow for modifications.
• Replaced newline characters in messageContent with spaces and extracted content after </think> tag if present.

Simplification of code:

• Removed unnecessary checks and warnings related to the length of the message content.

Clarification in prompt message:

• Updated the summarizeFirstPrompt to provide clearer instructions by adding "Here is the message:" before the message content.

[github-actions]

This is the build for this pull request. You can download it from the Artifacts section here: Build URL.

[github-actions]

This is the build for this pull request. You can download it from the Artifacts section here: Build URL.

[louis-menlo]

This PR also addressed #4343