fix(editor): can't edit .md source files

[hshpy]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes an issue where .md source files cannot be edited by adding a raw parameter to the useFetchText hook to fetch files in their raw format without processing.

• Modified useFetchText hook to accept an optional raw parameter
• Updated text editor component to use raw mode when fetching content
• Added URL parameter logic to append raw=true when raw mode is enabled

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/hooks/useUtil.ts	Added optional raw parameter to useFetchText hook with URL parameter handling
src/pages/home/previews/text-editor.tsx	Updated to call useFetchText with raw=true parameter

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