fix(files): an upload is said once in any order, copy buttons speak, a link list that failed says so

- The queue holds an upload it sees land done while this tab's upload still waits for its answer, so
  the dialog's notice is the only one whichever comes first; another device's upload follows after.
- One `useCopyFeedback` for every Copy beside a value (token, share link, set-password link): Copied
  for a moment, a notice a screen reader hears, a warning when the clipboard refuses; the token
  dialog's two Copy buttons are named by what they copy.
- The share dialog's link list shows loading, and a load error with Retry, never "no links" — and no
  New link beside a list it has not seen.
- The settings texts say that signing out elsewhere or a password change revokes the API tokens.
- DESIGN.md logs the folder-link decisions; the design lab keeps only the chosen renderings of the
  Links, Tokens and Files rounds.

frontend/src/design-lab/DesignLab.tsx

@@ -77,11 +77,14 @@ export default function DesignLab() {
           />
         </label>
         <nav className="flex flex-wrap gap-1 text-xs">
-          <a href="#open-tokens" className="rounded-md px-1.5 py-0.5 text-accent state-layer">
-            Tokens
+          <a href="#open-links" className="rounded-md px-1.5 py-0.5 text-success state-layer">
+            Links ✓
           </a>
-          <a href="#open-files" className="rounded-md px-1.5 py-0.5 text-accent state-layer">
-            Files
+          <a href="#open-tokens" className="rounded-md px-1.5 py-0.5 text-success state-layer">
+            Tokens ✓
+          </a>
+          <a href="#open-files" className="rounded-md px-1.5 py-0.5 text-success state-layer">
+            Files ✓
           </a>
           <a href="#decided" className="rounded-md px-1.5 py-0.5 text-success state-layer">
             A ✓
@@ -109,23 +112,25 @@ export default function DesignLab() {
         <header id="open-links" className="mt-6 scroll-mt-20">
           <h2 className="text-xl font-bold">Decided · Folder links</h2>
           <p className="text-sm text-muted">
-            A /watch link that opens a whole folder. Picked: A, A, A — the variants with the accent
-            edge (built; on the public list a picture-less row keeps its glyph above the length).
+            A /watch link that opens a whole folder. Picked: Copy link beside Share with link… in
+            the folder menu, a list the link opens with the player above it, a link mark in the
+            rail.
           </p>
         </header>
         <LinksRound />
         <header id="open-tokens" className="mt-6 scroll-mt-20">
           <h2 className="text-xl font-bold">Decided · API tokens, a machine&apos;s key to Files</h2>
           <p className="text-sm text-muted">
-            Settings → API tokens. Picked: A, A, A — the variants with the accent edge (built; the
-            expiry is a segmented control, DESIGN.md "A choice between a few values").
+            Settings → API tokens. Picked: a row per token in three lines, the kind asked first (Hub
+            csere or Egyedi, rights as chips per folder), the token shown once in the same dialog.
           </p>
         </header>
         <TokensRound />
         <header id="open-files" className="mt-6 scroll-mt-20">
-          <h2 className="text-xl font-bold">Open · Files, the one library</h2>
+          <h2 className="text-xl font-bold">Decided · Files, the one library</h2>
           <p className="text-sm text-muted">
-            The page that replaces Downloads. The recommended variant has the accent edge.
+            The page that replaced Downloads. Picked: list rows (the grid a toggle), an app-wide
+            download tray, a done notification that copies the link.
           </p>
         </header>
         <FilesRound />