Fix loading glitches

[Ximik]

No description provided.

[buffrr]

Hmm I often see "Syncing chain %100" could this show more granular progress in that case? or fallback to showing the overall wallet syncing progress instead if its at %100. (I'm referring to the higher level progress property in the wallet info struct)

[Ximik]

Unfortunately, there is not much can be done here without some major changes. But we can think about some changes in the akron.
But this ready flag at least prevents the user from making the calls before the headers are synced (when yuki is used).

[buffrr]

I don't see the point of this PR. Could you clarify why this is necessary and why major changes are needed? seems the loading glithces are trivial to fix in akron itself.