Function mountInspector

Mounts the inspector panel into container and returns an InspectorHandle for pushing updates and cleanup.

The panel renders one of four views depending on context:

• Single byte – offset, numeric value, bit grid, numeric interpretations, Unix timestamp guess, and the original value when the byte was edited.
• Range – start/end, hex preview, text preview (with encoding selector), numeric interpretations (≤ 8 bytes), entropy, color preview (3–4 bytes), Base64, and a list of modified bytes within the range.
• Drag in progress – provisional selection length only.
• Section metadata – name, type, range, flags, and parser metadata grid.