fix fetching fee UX

[dewabisma]

Summary

Ensure button is disabled when fee is stale. Also show loader in the fetching fee section.

[n13]

Changed a few things

the actual spec was this:

• The button should never be disabled the user should never wait for the fee fetching
• So we fetch fee initially before user has even typed anything, then update only silently, never disabling the button
• Also found that the search field made no sense - I know it's in the design (with different text BTW)... but it doesn't make sense we're not searching for anything

[dewabisma]

I think it's good now

[cursor]

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