Feature Request: `claude -c` should gracefully start a new session when no previous conversation exists

Motivation

I often use claude -c as my default way to launch Claude, expecting it to pick up where I left off or just start fresh if there's nothing to continue. On a new machine or after clearing sessions, this workflow breaks with a hard error, forcing me to re-run without -c.

Current Behavior

claude -c errors out with "No conversation found to continue" when there are no previous sessions. This is a hard stop.

Desired Behavior

Warn and fall back to a fresh session instead of erroring:

⚠ No previous conversation found. Starting a new session.

Why

• Scripting/aliases: alias cc="claude -c" shouldn't break on a clean state.
• Fresh installs: No prior session isn't an error, it's just nothing to continue.
• Least surprise: Starting fresh is the obvious, safe fallback.