* proj: replace the deprecated circle class with rounded-full

[Lwrless]

lib/utilities/src/borders/rounded.css:9 marks .circle deprecated in favour of
.rounded-full, aliasing both to -rounded-full. This sweeps the remaining call sites.

Stacked on #240. 126 of the sites live in lib/avatar-group/README.md and its docs
page, both rewritten by that PR, so the base is dev_optimize_css_libs rather than
dev_optimize. When #240 merges GitHub retargets this automatically — provided the
branch is deleted on merge; otherwise retarget by hand.

Commits

1. docs and dev pages — 190 replacements over 178 lines in 16 files.
2. component output — @zui/avatar and @zui/upload-imgs move to rounded-full.
3. compatibility — those two keep emitting circle as well.

Commits 2 and 3 are kept separate because the middle state is the interesting one to
review: 2 alone is a breaking change for downstream CSS, and 3 is the reason this PR is
not one. Happy to squash them if you prefer a single commit.

No breaking change

Commit 2 on its own would break anyone whose CSS selects .circle on an avatar or on the
upload-imgs file-size badge — the only part of this branch with blast radius outside the
repo, hiding inside what otherwise reads as a docs sweep. Commit 3 emits both classes
instead, the ordinary way to retire a class in shipped output: existing consumer CSS keeps
matching, while the components stop making the deprecated name the only option.

The two DOM tests assert both names, so dropping either becomes a deliberate edit. When
the alias is finally removed from rounded.css, circle comes out of the two call sites
and the two assertions together.

@zui/search-box emits only rounded-full for its identical circle option
(search-box.tsx:188). That break already shipped; left alone rather than widening this PR.

Two things the original scan missed

The sweep was scoped from a scan of class / className attribute values, which found
177 sites. Two categories sit outside that shape and are included here:

• Runtime class strings in two components — avatar/src/component/avatar.tsx:58
  (finalClass.push('circle')) and upload-imgs/src/vanilla/upload-imgs.ts:122
  (.addClass('… circle …')) put the class into consumers' DOM, not just the docs.
• data-type / type values in the messager docs. messager-item.tsx:44 feeds
  type straight into classes(), so data-type="primary circle" renders the class at
  runtime. Their button labels mirror the value and move with it.

Deliberately untouched

light-circle, progress-circle, the .circle selector in rounded.css itself, the
<circle> SVG elements in @zui/progress-circle, the circleColor / circleWidth /
circleBg props, and the circle option props of @zui/avatar, @zui/picker and
@zui/search-box. A loose s/circle/rounded-full/g corrupts all of these.

Removing the deprecated alias from rounded.css is out of scope — it is a public CSS
class and dropping it breaks downstream consumers. Sweep first, decide the alias later.

Verification

• 0 remaining circle class tokens in docs under lib/; guard-token counts unchanged
  (light-circle 49, progress-circle 10, circleColor 12, circleWidth 13,
  circleBg 9, circleSize 5, <circle 2).
• Every changed doc line differs only by the token — checked line-by-line, not by eye.
• pnpm build emits byte-identical CSS for all seven artifacts.
• The rendered avatar-group docs page has all 584 class attributes identical once
  circle and rounded-full are normalised to one token.
• pnpm check green; pnpm docs:build green.

Note on line endings

Four .md files use CRLF (avatar/README.md, both avatar-group files,
input-control/docs/…/index.md). A first pass normalised them to LF and inflated the diff
to 838 lines; endings are preserved here, so the doc diff is 182 lines.