Don't send uris to model, fix jetbrains current file

[RomneyDa]

Fixe security and consistency issues with context providers

• Make context providers (currentFile, file, current file from resolveInput) consistent: description = last 2 path parts, codeblock header = full relative path, name = basename
• Removes "getCurrentFile" webview to IDE call - uses currentFile context provider for more consistency. This Fixes for jetbrains because was the only remaining message direct from webview to ide that didn't have the new messaging format but was coming from both core and webview so couldn't trivally wrap with e.g. { status, done, content }

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