fix(a11y): chips, grips, the panel tab and Back to top keep the focus somewhere real

- F5: a chip's × pressed from the keyboard hands the focus to the next chip (else the previous one,
  else what follows) before it unmounts — in DismissibleChip, so all five chip rows get it
  (`focusNeighbour` in lib/useFocusKeeper).
- F4: a drag grip names what it lifts (`common.order.dragNamed`: panel groups, personal views);
  the two generic "Drag to reorder" keys are gone.
- F6: the side panel's edge tab is out of the Tab order while the card covers it, names its panel,
  and a keyboard pin moves the focus into the card.
- F7: Back to top is no Tab stop while hidden, and a keyboard press leaves the focus on the page.

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

@@ -54,7 +54,8 @@
     "top": "Legfelülre",
     "up": "Eggyel feljebb",
     "down": "Eggyel lejjebb",
-    "bottom": "Legalulra"
+    "bottom": "Legalulra",
+    "dragNamed": "„{{name}}” átrendezése"
   },
   "copy": {
     "title": "Cím másolása",