fix(tabs): stop drag auto-scroll

[janburzinski]

Description

• fixes tab bar "disappearing" during tab drag

Screenshot/Recording (if applicable)

https://cap.link/z86xe7s5cqb7hef

Checklist

• I kept this PR small and focused
• I ran a self-review before opening this PR
• I ran the relevant local checks or explained why not
• I updated docs when behavior or setup changed
• I added or updated tests when behavior changed, or explained why not
• I only added comments where the logic is not obvious
• I used Conventional Commits for commit
  messages and, when possible, the PR title

[greptile-apps]

Greptile Summary

This PR fixes an issue where the tab bar would visually "disappear" during tab drag operations by disabling the auto-scroll behavior of @dnd-kit/core's DndContext.

• Adds autoScroll={false} to the DndContext in SplitPaneLayout, preventing dnd-kit from manipulating scroll position during drag, which was causing the tab bar to scroll out of view.

Confidence Score: 5/5

Single-prop addition with no risk of regressions; tab drag still works, just without auto-scroll.

The change is a one-prop addition to DndContext that stops dnd-kit from adjusting scroll during drag. The tab bar is a fixed-height horizontal strip where auto-scroll provided no useful behavior anyway, so disabling it has no negative UX side effects in realistic usage.

No files require special attention.

Important Files Changed

Filename	Overview
apps/emdash-desktop/src/renderer/features/tasks/view/task-main-column.tsx	Adds autoScroll={false} to DndContext to prevent the tab bar from scrolling out of view during tab drag operations.

Sequence Diagram

%%{init: {'theme': 'neutral'}}%%
sequenceDiagram
    participant User
    participant DndContext
    participant AutoScroll
    participant TabBar

    Note over AutoScroll: autoScroll=false (this PR)

    User->>DndContext: "Start drag (pointer down + distance > 6px)"
    DndContext->>TabBar: onDragStart → setActiveDragId
    DndContext--xAutoScroll: Auto-scroll suppressed
    Note over TabBar: Tab bar stays visible
    User->>DndContext: Release pointer
    DndContext->>TabBar: onDragEnd → handleDragEnd / onDragCancel
    DndContext->>TabBar: setActiveDragId(null)

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%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
sequenceDiagram
    participant User
    participant DndContext
    participant AutoScroll
    participant TabBar

    Note over AutoScroll: autoScroll=false (this PR)

    User->>DndContext: "Start drag (pointer down + distance > 6px)"
    DndContext->>TabBar: onDragStart → setActiveDragId
    DndContext--xAutoScroll: Auto-scroll suppressed
    Note over TabBar: Tab bar stays visible
    User->>DndContext: Release pointer
    DndContext->>TabBar: onDragEnd → handleDragEnd / onDragCancel
    DndContext->>TabBar: setActiveDragId(null)

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_{Reviews (1): Last reviewed commit: "fix(tabs): stop drag auto-scroll" | Re-trigger Greptile}