feat: improve console virtualisation

[bajrangCoder]

No description provided.

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with no concrete correctness, security, or repository-rule violations identified.

Summary

• Extends clean offset tables incrementally when appending items.
• Adds directional overscan, immediate reversal rendering, and buffered-window render suppression.
• Reconciles ResizeObserver targets incrementally instead of reconnecting every render.
• Adds coverage for jumps, reversals, list boundaries, offset rebuilding, observer lifecycles, and stable buffered windows.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[Scroll event] --> B[Calculate delta, direction, and dynamic overscan]
  B --> C{Direction changed?}
  C -- Yes --> D[Perform full synchronous render]
  C -- No --> E{Viewport remains inside half-buffer?}
  E -- Yes --> F[Keep existing mounted window]
  E -- No --> D
  D --> G[Rebuild dirty offsets]
  G --> H[Compute directional before/after range]
  H --> I[Update mounted rows and spacers]
  I --> J[Observe added rows and unobserve removed rows]

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