fix: resolve IndexOutOfBounds and incorrect ordering when dragging po…

[mathuo]

…pout panels

Fixes GitHub issue #1004 where dragging single panels from popout windows back into the dock caused IndexOutOfBounds errors and incorrect positioning.

Changes:

• Replace error-throwing bounds check with index clamping in tabs.ts
• Add special validation for popout panel drops in dockviewComponent.ts
• Ensure calculated drop indices are within valid bounds for destination groups

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Sandbox	Source
externaldnd-dockview	Configuration
fullwidthtab-dockview	Configuration
iframe-dockview	Configuration
keyboard-dockview	Configuration
nativeapp-dockview	Configuration
rendering-dockview	Configuration