Refine LogViewer mobile touch scrolling

[khaliqgant]

Summary\n- adjust mobile touch fallback to drive xterm scrollLines with line-height tracking\n- gate touch bindings until terminal is ready\n- keep viewport touch handling with preventDefault to avoid body scroll\n\n## Testing\n- not run

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📊 1 file reviewed • 3 need attention

🚨 High Risk:

• src/dashboard/react-components/XTermLogViewer.tsx — Critical handling around touch events and potential edge case scenarios must be reviewed carefully.
• src/dashboard/react-components/XTermLogViewer.tsx — Initialization of variables used for touch tracking needs to be verified to avoid miscalculations.

⚠️ Needs Attention:

• src/dashboard/react-components/XTermLogViewer.tsx — Code clarity and maintainability can be improved without affecting functionality.

📚 Relevant Past Discussions:

• ⚠️ Unresolved discussions on XTermLogViewer.tsx — 2 unresolved comments on this file from past PRs

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