v9.4.8

• Read border-only glyph bitmaps without treating them as missing ink in BasemapLayer (#973).
• Add compact translucent sleek-light and sleek-dark panel presets, custom theme definitions, and preset-aware nested inheritance and inversion (#977).
• Add header, footer, and hidable side panels and optional box pinning around an application-owned PanelManager.contentElement; nested panels can observe container state (#976).
• Embed panels with mountPanel, ReactPanel, and useReactPanel, preserving React context and supporting inherited or custom themes. Collapsing a pinned box releases its docked space and leaves a compact restore bar (#978).