Add persistent setting for verbose/expanded output mode

Feature Request

I'd like a persistent setting to keep verbose output (Ctrl+O / app:toggleTranscript) always enabled by default.

Currently, Ctrl+O toggles verbose mode per session, but there's no way to make it the default. I have to press Ctrl+O at the start of every session.

Proposed Solution

Add a setting like verbose: true in ~/.claude.json or ~/.claude/settings.json that makes verbose/expanded output the default when starting a new session.

Why

When working on complex tasks with many tool calls, I always want to see the full output. Having to remember to toggle it every session is friction that a simple config option would eliminate.

Current Workaround

Press Ctrl+O at the start of each session. The --verbose CLI flag exists but only applies to non-interactive mode.