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/i18n/locales/en/settings.json

@@ -99,16 +99,16 @@
       "new": "New password (min. 10 characters)",
       "save": "Save password",
       "saving": "Saving…",
-      "saved": "Password updated for {{email}}",
+      "saved": "Password updated for {{email}} — other sessions were signed out and your API tokens revoked",
       "failed": "Couldn't update the password"
     },
     "sessions": {
       "title": "Active sessions",
-      "hint": "Sign this account out everywhere else — handy if you left it signed in on a shared or lost device. You stay signed in here.",
+      "hint": "Sign this account out everywhere else, and revoke its API tokens — handy if you left it signed in on a shared or lost device. You stay signed in here.",
       "action": "Log out other sessions",
       "confirmTitle": "Log out other sessions?",
-      "confirmBody": "This signs you out of every other browser and device. You'll stay signed in here.",
-      "done": "Signed out of all other sessions",
+      "confirmBody": "This signs you out of every other browser and device, and revokes every API token of yours (make new ones for your machines). You'll stay signed in here.",
+      "done": "Signed out of all other sessions; API tokens revoked",
       "failed": "Couldn't sign out other sessions. Please try again."
     }
   },
@@ -284,6 +284,7 @@
     "tryIt": "Try it (curl)",
     "copy": "Copy",
     "copied": "Copied",
+    "copyField": "Copy: {{field}}",
     "done": "Done"
   }
 }