Same shape as the earlier prompt trigger cleanup: nothing renders the
MCP resources menu button, and the only live entry into resource
browsing is Settings > MCP Servers plus the attachment resource
picker. Drop onMcpResourcesClick, hasMcpResourcesSupport,
MCP_RESOURCES_CLICK, the AttachmentItemVisibleWhen enum and
hasResourcesCapability; the resources display, browser and picker
components are untouched.
Assisted-by: pi