Gemini CLI nightly: MCP OAuth token refresh uses stored client ID

A single core fix in this nightly: MCP OAuth token refreshes now use the stored client ID. Relevant only if you connect Gemini CLI to OAuth-protected MCP servers and hit refresh failures.

Tool: gemini-cli · Version: v0.56.0-nightly.20260811.geef19f25c · Significance: 2/5 · fix