fix(ui): the platform layer speaks platform words; boxes scale with the text

- PriorityStepper labelled itself with channels.row.* and told every caller
  it orders the Feed; Combobox said plex.loading / plex.filter.moreRefine /
  sidebar.match on the feed sidebar. The generic strings moved to common.*,
  and what a priority MEANS arrives as the stepper's `hint` prop.
  uiI18n.contract.test.ts pins components/ui/ to the platform namespaces —
  the import boundary could never see an i18n key.
- 32 px-frozen box utilities (w-[150px], max-w-[1600px], left-[18px], …)
  became spacing-scale steps (w-37.5, max-w-400, left-4.5): identical at the
  default text size, and now they grow with the Settings slider instead of
  clipping or re-wrapping their own labels. An eslint rule refuses the px
  form beside the older text-[Npx] one, pinned by pxBox.contract.test.ts;
  measured in the browser that every new step is generated at its old px.
- chipLane's import-strip regex ran past a side-effect import into the next
  statement's `from`, hiding a lane between them; it now stops at the
  import's own `;`.

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

@@ -108,9 +108,6 @@
     "editTags": "Edit tags",
     "filterFeedByTag": "Filter the Feed by “{{name}}”",
     "priorityHint": "Your ranking for this channel. Sort the Feed by “Channel priority” to bring higher-priority channels to the top.",
-    "raisePriority": "Raise priority",
-    "lowerPriority": "Lower priority",
-    "editPriority": "Click to type a priority (negatives allowed)",
     "fullHint": "Full history fetched.",
     "fullySynced": "fully synced",
     "fullySyncedHint": "Recent uploads and the full back-catalog are both in.",

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

@@ -27,5 +27,12 @@
   "scrollRight": "Scroll right",
   "search": "Search",
   "remove": "Remove",
-  "noResults": "No matches"
+  "noResults": "No matches",
+  "priority": {
+    "raise": "Raise priority",
+    "lower": "Lower priority",
+    "edit": "Click to type a priority (negatives allowed)"
+  },
+  "moreRefine": "{{count}} more — refine with search",
+  "matchMode": "Match"
 }

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

@@ -111,8 +111,7 @@
       "remux": "Direct Stream",
       "transcode_hw": "Transcode · HW",
       "transcode_sw": "Transcode · SW"
-    },
-    "moreRefine": "{{count}} more — refine with search"
+    }
   },
   "count": "{{count}} titles",
   "searchCount": "{{count}} matches",

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

@@ -20,7 +20,6 @@
   "any": "Any",
   "all": "All",
   "tagModeTooltip": "Match any vs all selected tags",
-  "match": "Match",
   "custom": "Custom",
   "from": "From",
   "to": "To",

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

@@ -108,9 +108,6 @@
     "editTags": "Címkék szerkesztése",
     "filterFeedByTag": "Feed szűrése: „{{name}}”",
     "priorityHint": "A te rangsorod ehhez a csatornához. Rendezd a Feedet „Csatorna prioritás” szerint, hogy a magasabb prioritású csatornák felülre kerüljenek.",
-    "raisePriority": "Prioritás növelése",
-    "lowerPriority": "Prioritás csökkentése",
-    "editPriority": "Kattints a prioritás beírásához (negatív is lehet)",
     "fullHint": "Teljes előzmény letöltve.",
     "fullySynced": "teljesen szinkronban",
     "fullySyncedHint": "A legutóbbi feltöltések és a teljes archívum is megvan.",

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

@@ -27,5 +27,12 @@
   "scrollRight": "Görgetés jobbra",
   "search": "Keresés",
   "remove": "Eltávolítás",
-  "noResults": "Nincs találat"
+  "noResults": "Nincs találat",
+  "priority": {
+    "raise": "Prioritás növelése",
+    "lower": "Prioritás csökkentése",
+    "edit": "Kattints a prioritás beírásához (negatív is lehet)"
+  },
+  "moreRefine": "még {{count}} — finomíts kereséssel",
+  "matchMode": "Egyezés"
 }

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

@@ -111,8 +111,7 @@
       "remux": "Közvetlen streamelés",
       "transcode_hw": "Átkódolás · HW",
       "transcode_sw": "Átkódolás · SW"
-    },
-    "moreRefine": "még {{count}} — finomíts kereséssel"
+    }
   },
   "count": "{{count}} cím",
   "searchCount": "{{count}} találat",

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

@@ -20,7 +20,6 @@
   "any": "Bármelyik",
   "all": "Összes",
   "tagModeTooltip": "Bármelyik vagy az összes kijelölt címke illeszkedjen",
-  "match": "Egyezés",
   "custom": "Egyéni",
   "from": "Ettől",
   "to": "Eddig",