fix: review round 1 — row press after a rename, related reset, dead items on removal, honest Prev/Next

- A press that begins while a field in the row is edited only ends the editing (rowOpen latches it
  at pointerdown); the card layout's row press is now tested.
- A related video reset in the player forgets the session's stored position.
- Removing the playing video passes over known-dead items and steps the way it went.
- Prev/Next off only because of dead items stay focusable and say why (HU/EN).
- The docked bar's scroller leaves room for focus rings.
- A focus-opened About card is not closed by its own scroll into view.
- EN "Clear watch progress" for the video reset, distinct from a page's "Reset view".
- The signed-out title read goes to the page yt-dlp read; the retitle writes are conditional.
- Tests: the cap of three errors, the bar's own Fullscreen, the group glyph, the backfill's reads.

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

@@ -8,7 +8,7 @@
   "saveForLater": "Save for later",
   "unhide": "Unhide",
   "hide": "Hide",
-  "resetState": "Reset view",
+  "resetState": "Clear watch progress",
   "thisChannel": "This channel",
   "continueTitle": "Continue where you left off",
   "continue": "Continue",

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

@@ -5,6 +5,8 @@
   "back": "Back",
   "previous": "Previous",
   "next": "Next",
+  "noPlayableBefore": "No video before this one can play here",
+  "noPlayableAfter": "No video after this one can play here",
   "autoAdvance": {
     "label": "Auto",
     "hint": "When a video ends, what plays next. Click to cycle Off, Next, Previous, Random. Saved to your account.",

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

@@ -5,6 +5,8 @@
   "back": "Vissza",
   "previous": "Előző",
   "next": "Következő",
+  "noPlayableBefore": "Előtte nincs itt lejátszható videó",
+  "noPlayableAfter": "Utána nincs itt lejátszható videó",
   "autoAdvance": {
     "label": "Automatikus",
     "hint": "A videó végén mi jöjjön. Kattintásra vált: Ki, Következő, Előző, Véletlen. A fiókodhoz mentve.",