The `MarkdownBlock` widget itself handles scrolling, making the
`SingleChildScrollView` redundant. Removing it simplifies the widget
tree and improves performance by avoiding unnecessary layout calculations.
The `ConstrainedBox` was also removed as it was no longer needed after
removing the `SingleChildScrollView`.

…es() to avoid precision loss. Try replacing the use of the deprecated member with the replacement

This commit introduces support for managing `mcp_server.json` configurations in web environments by utilizing `shared_preferences`.

Key changes:
- In `McpServerProvider`:
    - `_loadServers`: For web platforms, loads server configuration from `shared_preferences`. If not found, loads from `assets/mcp_server.json` and saves it to `shared_preferences`. Sets `installed: true` for web servers.
    - `saveServers`: For web platforms, saves the server configuration to `shared_preferences`.
    - `_initConfigFile`: Skips file initialization for web.
- In `McpServerPage`:
    - Adjusts logic for checking command existence to use `getPlatformPath()` which returns `null` for web.
    - Updates platform checks to use `kIsMobile` and `kIsWeb` for consistency.
- In `platform.dart`:
    - Adds `getPlatformPath()` function to retrieve the `PATH` environment variable, returning `null` for web platforms.

Feature Request: Add Web Platform Support