Enhance dynamic page title generation with fallback to app name

[bishwajitcadhikary]

Updated the title function to support pages without a custom title.
Now, if no title is provided, it will default to displaying only the appName.
This improves consistency across routes and prevents malformed titles like - AppName.

Before:

title: (title) => `${title} - ${appName}`

After:

title: (title) => title ? `${title} - ${appName}` : appName

[Plytas]

I swear I saw this PR being merged before. Turns out it was just for app.ts, not ssr.ts 👍
#140

[Plytas]

Question to the team @taylorotwell @tnylea

Since both title and page resolver seems to be the same in both app.ts and ssr.ts, would it make sense to abstract them in let's say /resources/js/lib/utils.ts (or some other place)? This way it would be reused and most importantly consistent, without having to change it in 2 places all the time.

[bishwajitcadhikary]

I swear I saw this PR being merged before. Turns out it was just for app.ts, not ssr.ts 👍
#140

You're right