Visual feedback that "Tip" button is clicked and its thinking (for slow sites like reddit)

[Plasma]

Description

When clicking the Tip button on a Reddit post, it can take upwards of 4 seconds for Reddit servers to respond before the tip screen is shown.

When I first used this feature, I thought the button was broken, as I didn't see Brave browser doing anything.

A site like Twitter though appears to work near instantly.

Just a suggestion to consider adding a 'Loading' indicator or spinner or something to indicate the Tip screen is being loaded.

See this video for an example from Australia:

brave-tip.mp4

Steps to Reproduce

1. Visit https://www.reddit.com/r/BATProject/ (for example)
2. Click on "Tip" next to a post
3. Notice it takes several seconds (from Australia) to load the Tip screen

Actual result:

1. I'm left wondering if the Tip button did anything for a few seconds after the first use

Expected result:

1. Consider a bit of UI feedback that the Tip screen is loading

Reproduces how often:

Always (for reddit), for other sites like Twitter there is minimal delay and not noticeable.

Desktop Brave version:

Brave | 1.21.77 Chromium: 89.0.4389.90 (Official Build) (64-bit)
Revision | 62eb262cdaae9ef819aadd778193781455ec7a49-refs/branch-heads/4389@{#1534}
OS | Windows 10 OS Version 2009 (Build 19042.867)