Make protocol URL configurable for editor integration in openFile

[cogscides]

Currently, the openFile function (in packages/react-grab/src/primitives.ts) uses a hardcoded protocol URL to open files in editors, such as vscode://file/.... This limits flexibility for users who may use different flavors or versions of editors (e.g., vscode-insiders://file/..., or other editor protocols).

Feature request:

Allow users to customize or control the protocol URL used to open files. This could be via a configuration option, environment variable, or function parameter.

Benefits:

• Supports more user setups (e.g., VSCode Insiders, other editors with protocol support)
• Improves developer experience for teams with mixed editor environments
• Enables easier testing and extension for future integrations

Proposal:

• Abstract the protocol part of the URL in openFile and related helpers.
• Provide a way (parameter, config, env) to override the protocol.
• Update documentation to describe how users can change the protocol.

[pullfrog]

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