Add mobile touch scroll fallback for LogViewer

[khaliqgant]

Summary\n- add manual touch scrolling fallback for xterm viewport on coarse pointers\n- disable pointer events on xterm screen/canvas/textarea for mobile scroll\n\n## Testing\n- not run

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📊 1 file reviewed • 5 need attention

⚠️ Needs Attention:

• src/dashboard/react-components/XTermLogViewer.tsx — This file implements new touch event functionalities affecting performance and user interaction, necessitating a careful examination of edge cases and event handling.

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