treefmt: apply prettier

Pure `nix fmt` output from the commit before this one — no hand edits.
203 files: 52 md, 42 tsx, 32 js, 32 css, 21 ts, 13 html, 8 json, 3 mjs.

Reproduce with `nix develop -c nix fmt` on the parent commit; the result
should be byte-identical to this tree.

None of the 13 `.prettierignore` entries appears here — verified by
intersecting the changed-file list against the ignore file, with a
control proving the intersection finds a match when one exists.

frontend/packages/swarm-ui/src/css.d.ts

@@ -1,4 +1,4 @@
 // Ambient module for `import './Foo.css'` side-effect imports (esbuild
 // resolves these directly, see build.mjs; tsc otherwise has no idea what
 // a `.css` specifier is and refuses the whole side-effect import).
-declare module '*.css';
+declare module "*.css";