fix(cli): exit after printing the version instead of opening a session

[charliezong18]

happy --version prints the version and then deliberately falls through to auth, daemon startup and runClaude. On a machine without stored credentials that means a version query drops into the interactive login picker — which is what #1532 reports.

Exit right after printing, the same way the --help branch above already does.

Fixes #1532

Proof

Run from source against an isolated HAPPY_HOME_DIR (no stored credentials), stdin closed, 20s hard timeout.

Before — main:

happy version: 1.2.1

How would you like to authenticate?

› 1. Mobile App
  2. Web Browser

Use arrows or 1-2 to select, Enter to confirm

  ERROR Raw mode is not supported on the current process.stdin, which Ink uses

After — this branch:

happy version: 1.2.1

Nothing else runs: no auth, no daemon, no session.

Validation

• happy-cli typecheck: no new errors relative to main
• One behavioural line in packages/happy-cli/src/index.ts; no other file touched
• index.ts has not been modified upstream since this fix was written, so it applies without drift

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