fix(clip): a time's error line sits in the flow, the remove button off the cut, and every player surface rings amber

- useTimecodeField holds a time field's draft for its caller, which places TimecodeError (role
  alert) in its own flow under the fields' row: it no longer lies over the crop row taking its
  clicks, runs out of the editor's card, or joins the field's <label> name.
- The editor's remove-cut buttons sit in a row under the track at their cut (trackLeft), off the
  cut's grab area, where a press drags it; RangeTrack's adornment slot is gone.
- media-focus re-points --focus to the media amber on the Plex player, the YouTube stage and every
  bg-media-chrome surface; a contract test holds each such class string to media-focus or
  media-scope, the field's focus edge to the focus token, and --color-focus to the inline theme.
- An upload's quota headline says the converted file does not fit, not "Storage full".
- DESIGN.md: the tokens paragraph says what is re-pointed where; the decision row measures all
  three colours on the chrome.

frontend/src/i18n/locales/en/downloads.json

@@ -243,6 +243,7 @@
       "detailsToggle": "Technical details",
       "upload": {
         "quota_exceeded": {
+          "short": "Not enough storage for the converted file",
           "body": "The phone-ready version of this upload would not fit in your storage quota. Your original is kept – delete something from your library, then try again."
         }
       },

frontend/src/i18n/locales/hu/downloads.json

@@ -243,6 +243,7 @@
       "detailsToggle": "Technikai részletek",
       "upload": {
         "quota_exceeded": {
+          "short": "Nincs elég hely az átalakított fájlnak",
           "body": "A feltöltés telefonra alakított változata nem fér bele a tárhelykeretedbe. Az eredeti megmaradt – törölj valamit a könyvtáradból, majd próbáld újra."
         }
       },