fix(app): fix flicker and navigation when collapsing/expanding projects

[albingroen]

Fixes #6657

Changes

• Memoize the worktrees in the session-header.tsx component to prevent the right side content flicker and navigate.
• Create a new utility file called same.ts to dry up the code a little bit.

Demo

Before

https://github.com/user-attachments/assets/a33ed784-14fb-498f-8970-fe74e8332f76

After

https://github.com/user-attachments/assets/de6cd7ea-635b-4291-8f71-5d86cd24394e

[adamdotdevin]

hey @albingroen could you resolve conflicts? then i'll merge!

[albingroen]

hey @albingroen could you resolve conflicts? then i'll merge!

Yes, will fix when I get home!

[albingroen]

hey @albingroen could you resolve conflicts? then i'll merge!

Yes, will fix when I get home!

@adamdotdevin Now they should be fixed