fix(client): stabilize database tree horizontal scrolling

[openai0229]

Summary

• replace the legacy max-content, inherited positioning, and visible-overflow overrides with rc-virtual-list horizontal scrolling
• measure rendered tree-title widths while preserving vertical virtualization, including virtual horizontal-offset compensation
• reset stale width ranges when tree data, expansion state, editing state, or panel width changes, while accumulating wider nodes during vertical browsing
• keep the horizontal scrollbar at the bottom, hide it while idle, and keep it visible during thumb dragging
• add focused tests for width calculation, measurement-cycle reset, and virtual-scroll offset handling

Root cause

The previous CSS-based approach forced content sizing through multiple internal Ant Tree and virtual-list layers. Those overrides conflicted with virtualization: horizontal wheel events were consumed by the inner list, stale outer offsets clipped expand icons, and narrow panels could not scroll reliably.

Validation

• yarn test:tree-loading
• targeted ESLint for the changed NewTree files
• git diff --check
• Community JCEF Webpack hot-reload compilation and manual narrow-panel verification

Notes

The repository-wide yarn tsc --noEmit --pretty false command still reports existing unrelated type errors across the frontend; it reported no new error in the files changed by this PR.

[github-actions]

Reviewed commit f3756fb. Findings: 0 critical, 0 high, 1 medium. The horizontal scrollbar cannot be initiated by pointer drag while idle because pointer events are disabled; please address the linked finding. Merge recommendation: comment pending that fix. Coverage limit: read-only review of the current GitHub diff and metadata; no code, tests, or runtime checks were executed.

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[github-actions]

Reviewed commit 0da6224. Findings: 0 critical, 0 high, 0 medium. Merge recommendation: no actionable findings; the prior scrollbar pointer-events finding is addressed by the current diff. Coverage limit: read-only inspection of the current GitHub metadata, diff, reviews, and line comments; no code, tests, or runtime checks were executed.

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