[BUG] Startup welcome banner inconsistently truncated in some projects

Description

The Claude Code startup banner renders inconsistently across projects. In some directories, the full banner appears (box border, "Welcome back!", tips panel, recent activity). In others, it's truncated to just the mascot, version info, and model — no box, no tips, no recent activity.

Steps to Reproduce

1. cd ~/Projects and run claude — full banner
2. cd ~/Projects/android and run claude — truncated banner
3. Both use the same Claude Code version, same terminal, same window size

This is not strictly git vs non-git — it works in some git repos and not others.

Expected Behavior

The startup banner should render consistently across all projects.

Actual Behavior

• Some projects: Full welcome banner with box border, mascot centered, tips panel, recent activity
• Other projects: Truncated banner — just mascot, version, model info, no box border or panels

Screenshots

<img width="1728" height="238" alt="Image" src="https://github.com/user-attachments/assets/e2c1e382-d8c6-4e0f-8135-6c6cfc60f867" />

<img width="1728" height="451" alt="Image" src="https://github.com/user-attachments/assets/fab9344d-3bcf-4b27-9436-07427c1a2b48" />

Environment

• Claude Code v2.1.78
• macOS (Darwin 25.3.0)
• iTerm2

🤖 Generated with Claude Code