fix(tui): render hyperlinks in one pass without cursor flicker - #228
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Summary
Render native terminal hyperlinks through a custom Ratatui backend instead of a separate post-frame repaint. Keep the cursor hidden during rendering and synchronize the complete frame to prevent cursor flashes at intermediate draw positions.
Technical details
Single-pass hyperlink updates
Merge hyperlink metadata changes with Ratatui鈥檚 cell diff so changed targets and removed links update even when their text is unchanged, without printing those cells twice. Preserve wide-grapheme draw ordering, skipped image cells, overlay behavior, and the exclusion of internal
kit-image:targets from native hyperlinks.Frame and cursor lifecycle
Route both TUI draw paths through a shared synchronized-update helper and defer cursor visibility until final positioning. Attempt hyperlink closure, cursor restoration, and synchronized-update cleanup after output errors; terminal panic cleanup also closes hyperlinks and ends synchronized updates.