[bugfix] fix poll vote count responses on client and fedi API vote creation (#2343)

* increment poll votes *before* enqueuing vote to client API worker

* increment vote counts before federating status update after vote in local poll

* improved vote count calculation during backend -> frontend model conversion

internal/processing/workers/fromfediapi.go

@@ -233,6 +233,10 @@ func (p *fediAPI) CreatePollVote(ctx context.Context, fMsg messages.FromFediAPI)
 	p.surface.invalidateStatusFromTimelines(ctx, vote.Poll.StatusID)
 
 	if *status.Local {
+		// Before federating it, increment the
+		// poll vote counts on our local copy.
+		status.Poll.IncrementVotes(vote.Choices)
+
 		// These were poll votes in a local status, we need to
 		// federate the updated status model with latest vote counts.
 		if err := p.federate.UpdateStatus(ctx, status); err != nil {