file explorer context

[SharonStrats]

create the file explorer context in solid-ui so it can be used in both solid-panes and solid-ui

[Copilot]

Pull request overview

This PR introduces a shared Lit context contract for a File Explorer feature and exposes it from the package entrypoint, alongside a small fix to Menu’s item discovery logic to properly ignore only the trigger slotted element.

Changes:

• Add FileExplorerContext/FileExplorerEdit interfaces and fileExplorerContext (@lit/context) for File Explorer state and callbacks.
• Export the new context module from src/index.ts as part of the public API.
• Fix Menu.syncItems() filtering to exclude only slot="trigger" children (instead of excluding all slotted children).

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

File	Description
src/lib/file-explorer/context.ts	Adds a new Lit context definition and related TS interfaces for file explorer state/actions.
src/index.ts	Re-exports the new file-explorer context from the package entrypoint.
src/components/menu/Menu.ts	Adjusts menu item filtering to keep slotted menu items while excluding the trigger element.

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