Fix notebook desktop panel overflow on 13-inch viewports

[suguanYang]

Summary

• Fit default desktop panel widths to the rendered workspace width while preserving minimum panel sizes and drag resizing.
• Use the tabbed notebook layout below the desktop panel minimum width so narrow desktop/tablet widths such as 1099px do not show a clipped three-panel strip.
• Add unit coverage and Playwright regressions for the 1280px desktop viewport and the 1099px below-minimum breakpoint.

Fixes Ontos-AI/knowhere#107

Tests

• pnpm exec vitest run
• pnpm run typecheck
• pnpm run lint (passes with two existing unrelated warnings)
• pnpm run build
• Browser verification at 1280x832: desktop layout scrollWidth=1280, assistant panel right edge 1280
• Browser verification at 1099x832: desktop layout hidden, document scrollWidth=1099, tabbed layout visible

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Project	Deployment	Actions	Updated (UTC)
knowhere-notebook-staging	Ready	Preview, Comment	May 25, 2026 9:50am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
knowhere-notebook	Ignored	Preview	May 25, 2026 9:50am