Michael Suchacz b14bce12bf fix(site/src/pages/AgentsPage/components): fix model selector trigger layout on form-style pages (#28399)
Selecting a model on form-style pages (deployment AI settings such as
`/ai/settings/coder-agents`, the personal agent settings override rows,
and the advisor override) rendered a broken trigger: the provider icon
pinned to the far-left edge, the model name floating in the center, and
the chevron on the right. At desktop widths the field also collapsed to
content height (~22px) next to the 40px Clear/Save buttons.

Two defects in the shared `ModelSelector` trigger:

1. #28330 added the provider icon as a third direct flex child of the
trigger button. Form call sites override the trigger with
`justify-between` plus a width wider than its content, which spread
icon, label, and chevron apart. The icon and label now form a single
flex child so they stay adjacent under any `justify-*` override; the
chevron stays a direct child because the `[&>svg]` trigger styles target
it, and the label still truncates via `min-w-0`.
2. The base classes carried composer-pill responsive variants
(`md:h-auto`, `md:w-auto`, `md:shrink-0`). tailwind-merge resolves
conflicts per modifier, so `md:h-auto` silently defeated the call sites'
`h-10` at the `md` breakpoint (and `md:w-auto` defeated `w-[22rem]` on
the advisor row). The pill's responsive sizing now lives at its call
site, so plain `h-10`/width overrides win everywhere. The composer pill
is visually unchanged.

Also fixes the provider icon shrinking next to long model names: the
icon's `span` wrapper was a plain flex item whose automatic minimum size
collapses (preflight's `img { max-width: 100% }` scales the icon down as
the wrapper shrinks). The wrapper is now a `shrink-0` flex container, so
the label truncates while the icon keeps its 12px size (verified
red-green with a temporary probe: 7.3px without the fix).

Adds `FormFieldTriggerKeepsIconAndLabelAdjacent` and
`FormFieldTriggerTruncatesLongModelName` stories reproducing the
form-style trigger for visual snapshot coverage. Both defects were
verified red-green during development with temporary geometry probes
(icon-label gap 63.5px and height 30px without the fixes; gap 4px and
height 40px with them); per FE10 the committed story carries no geometry
assertions and the pixel snapshot guards the layout.

Also recolors the advisor "Uses / turn" and "Max tokens" field labels
from `content-placeholder` to `content-secondary` on the same settings
surface.

Remote dogfood UAT ran against this branch across desktop and narrow
viewports and passed.

> 🤖 Mux acted on behalf of @ibetitsmike to create this PR.
2026-08-20 19:24:10 +02:00
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