The /bring steps speak the home page's language #9712

Next in the design pass after #9433; #9645-#9649, #9688-#9690, #9693 and #9694 cover other pages. /bring is how an app from another forge arrives; its three steps still box each form in a card (bring.ts ~38, ~83, ~204, ~224).

Done looks like:

• [x] The page follows the opening principles of docs/DESIGN.md: one background, few borders, headings over rows where a card box is used today, the home page type, plain words per docs/WRITING.md.
• [x] Any new component class is named in docs/design/areas/<area>.md, never docs/DESIGN.md.
• [x] A test renders the page and asserts the rows-not-boxes shape for each step's form, and fails on the current markup.
• [x] bun scripts/design-lint.ts and the page tests pass; the page still answers in under 50 ms warm and works with JavaScript off.

Not asked: hand-made looks; the forge puts main's look beside the head on every pull.

Files: src/web/pages/bring.ts. Risk: each step must keep working without JavaScript, and the OAuth connect link is unchanged. Brief: a web builder.

Reviewed pull #9774 at its head: ticked The page follows the opening principles of docs/DESIGN.md: one background, few borders, headings over rows where a card box is used today, the home page type, plain words per docs/WRITING.md.; Any new component class is named in docs/design/areas/<area>.md, never docs/DESIGN.md.; A test renders the page and asserts the rows-not-boxes shape for each step's form, and fails on the current markup.; bun scripts/design-lint.ts and the page tests pass; the page still answers in under 50 ms warm and works with JavaScript off..