Visual feedback when tapping the action button on messages

[Hocuri]

When tapping the action button on a message (i.e. "Show Full Message", "Start" for Webxdcs, and "Download" for big messages"), there was no immediate visual feedback so far.

Since the Full Message / Webxdc activity takes some time to open, I was always a bit unsure whether I had misclicked or whether it's loading.

So, I find it quite a bit more comfortable like this.

Note that this also changes how the emoji and camera buttons in the message input field look when tapped.

I explained the reasoning for the changes in the commit messages.

If necessary, of course it's easily possible to tweak the colors.

[github-actions[bot]]

To test the changes in this pull request, install this apk: 📦 app-preview.apk

[github-actions[bot]]

To test the changes in this pull request, install this apk: 📦 app-preview.apk