fix(inspector): prevent window overflow on inspector pane toggle

[J2TeamNNL]

Summary

• Inspector pane toggle no longer causes content overflow in narrow windows
• recomputeWindowMinimumSize now runs in splitViewDidResizeSubviews so manual divider drags also update the floor
• Base content min size is re-derived on every call instead of being captured once at startup
• hideInspector pre-narrows the window minimum before animation starts, matching the pre-widening pattern in showInspector
• Added test covering the case where detail + inspector sum exceeds the 720pt base floor

Test plan

• Open connection, resize window to ~720pt, toggle inspector on → window grows to fit, no overflow
• Toggle inspector off → window shrinks minimum, content intact
• Drag divider narrow, toggle inspector → window auto-expands
• Rapid toggle (on/off/on) → minimum size stays correct throughout
• MainSplitViewControllerWindowMinimumSizeTests all pass

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[chatgpt-codex-connector]

Preserve the original minimum when recomputing

Because this derives the base from window.minSize after previous calls may have assigned window.contentMinSize, the computed floor can only grow. For example, showing the inspector widens contentMinSize to the pane sum; when hideInspector() calls recomputeWindowMinimumSize(inspectorCollapsed: true), window.minSize already reflects that widened value, so the base remains the larger width and the window never relaxes back to the original 720pt minimum. This keeps narrow editor windows stuck oversized after toggling the inspector once; keep a separate baseline/default content minimum instead of using the current mutable minSize.

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