Put the form link under its label instead of across the column

[Fivell]

Spotted by comparing fresh screenshots of current master against the ones in the README.

What it looks like

The README shows the form's "Set range" on its own line, directly under the label text. On Active Admin 3 it renders at the far right of the label column instead — 179px from the label it belongs to, with nothing between it and the inputs it drives.

Measured on a live page before the fix:

label  left=40   width=240
link   left=219  width=53   float=right

Why

Not a regression in this gem. The rule is unchanged since 2017:

form label.datetime_preset_filter_label .btn_timerange { float: right; … }

git log on the stylesheet ends at 66973db (2017-08-16), and the line that inserts the link into the label last changed in 5a3742c (2022-05-24). Nothing in the recent run of fixes touched either.

What changed is the label width Active Admin hands it. A float is taken out of flow and placed at the right of the current line; if it does not fit, it drops to the next one. The older Active Admin's label column was narrow enough that the text and the link could not share a line, so the float wrapped underneath — the look the README captured. Active Admin 3's 240px column fits both, so it stays up and to the right.

The fix

.datetime_preset_pair > label.datetime_preset_filter_label .btn_timerange {
  float: none;
  display: table;
  margin: 2px 0 0 0;
}

display: table keeps it shrink-to-fit, so the dashed underline stays under the words rather than stretching the whole 240px column.

The sidebar filter deliberately keeps the float. There the label and link share a narrow panel, right alignment is correct, and it is what the first README screenshot shows. That is the other half of the same rule, so the spec pins it as well — a fix for one context must not move the other.

Specs

Four examples reading getBoundingClientRect() from the rendered page:

	assertion	before
form	link left edge aligns with the label's	fails — 219 vs 40
form	link sits on its own line	fails — top 210 vs 212
form	link narrower than the label column	passes — guards against the fix stretching it
filter	link stays pinned right	passes — guards the context that must not change

Two fail on the parent commit, two pass by design. 28 examples, 0 failures after.