chore: Make apps more intuitive in use

[msluszniak]

Description

This PR adds:

• In LLM app - Adds better phrasing in voice chat example.
• In CV app - Blocks buttons when image not selected & add brief description of an example. Additionally, adds model selection list to classification example.
• In CLIP embeddings app - Removes text embedding comparison from this example (since it already is in text embeddings example) and make app more intuitive in use (chosen image is displayed). Also adds model selection list to both text and image embeddings.

Introduces a breaking change?

• Yes
• No

Type of change

• Bug fix (change which fixes an issue)
• New feature (change which adds functionality)
• Documentation update (improves or adds clarity to existing documentation)
• Other (chores, tests, code style improvements etc.)

Tested on

• iOS
• Android

Testing instructions

Run the following apps:

• LLM
• Computer Vision
• Clip embeddings

And check if described changes works correctly and does not introduce any problems.

Screenshots

Related issues

Closes #351

Checklist

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly
• My changes generate no new warnings

Additional notes

[msluszniak]

Changes from previous PR introduced some weird jumps in llm demo apps on iOS, working on it.

[barhanc]

In computer vision app using Android back button (or swipe from edge gesture) goes to Vision Camera screen instead of the screen selection menu.

[barhanc]

There is a problem with not being able to scroll the model list on Android in LLM and CV apps.

[msluszniak]

In computer vision app using Android back button (or swipe from edge gesture) goes to Vision Camera screen instead of the screen selection menu.

@barhanc you mean vision camera example here? I thing that other apps don't have back button.

[barhanc]

In computer vision app using Android back button (or swipe from edge gesture) goes to Vision Camera screen instead of the screen selection menu.

@barhanc you mean vision camera example here? I thing that other apps don't have back button.

No, I mean using the system navigation bar on Android.

[msluszniak]

I cannot approve my own PR (but you can add approve ;p), but every comment from you now works perfectly fine, so it's imo ready to ship it. 🚀