For app development for both the design and the coding aspect, the Macbook Air has really nailed it if you do compare Macbook Air with Macbook Pro.
10000000
Yes. Almost all iPhone apps are compatible with iPad.
There are apps that will only work with Mac OS X which can be on any Mac computer - iMac, MacBook, Mac Mini etc.
I do not believe so, I have an 11" Macbook Air and tried to make Applications, iPhone Apps, and Games. None of them worked for me, probably cause I have 10.8.2 instead of 10.7.5
Yes, you can use iTunes Gift Card money.
If you only use your iPad for internet I wouldn't. But if you use it for apps yes, then you can sync your Apple ID.
You would be downgrading if you buy an iPad to replace your macbook. I have a macbook and the iPad is nothing close to it. iPad is just nice for browsing, email, chat, and a bunch of apps. It can't do nearly as much as a macbook can. If your macbook is old, then sure, throw it out and get an iPad, but keep in mind that iPads don't have much hard-disk space. They range from 8 to 64 gig. Macs come with at least 160 and can go up to 500 gig.
Photoshop if you want to get fancy, but just to add text, use google's picasa.
MacBook Pro is the best you can get
macbook
Some fun apps to consider on a MacBook include GarageBand, which allows users to create and edit music, and Pixelmator, a versatile image editing tool for photo manipulation and design. For gaming, Steam offers a wide range of titles, while the App Store features games like "Civilization VI" and "Stardew Valley." Additionally, you might enjoy using the creative app Canva for graphic design or iMovie for video editing.