fix(tui): enable incremental rendering

[aidandaly24]

Summary

• enable Ink incremental rendering for the full-screen TUI
• update only changed terminal lines instead of erasing and rewriting the complete frame
• eliminate visible flashing during rapid navigation and other frequent UI updates

Testing

• bun test src/tui/tui.test.tsx (7 pass, 0 fail)
• tracked-source TypeScript check
• bun run lint:check
• bun run format:check
• bun run build
• manual Runtime list key-repeat validation

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.01%. Comparing base (ec57799) to head (4b657ce).

Additional details and impacted files

@@            Coverage Diff            @@
##           refactor    #1897   +/-   ##
=========================================
  Coverage     96.01%   96.01%           
=========================================
  Files           211      211           
  Lines          9837     9838    +1     
=========================================
+ Hits           9445     9446    +1     
  Misses          392      392           

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