feat(plex): on-screen ±10s skip buttons flanking play/pause (E6 S3)

Add discoverable rewind-10 / forward-10 controls to the Plex player control
bar, flanking play/pause (D5-A). New Skip10 glyph: an outline circular arrow
with a centred '10', deliberately distinct from the episode-level
SkipBack/SkipForward and from Restart's plain RotateCcw. Reuses seekTo; mirrors
the keyboard ←/→ (seekStep=10). i18n HU/EN aria-labels.

frontend/src/components/PlexPlayer.tsx

@@ -38,7 +38,7 @@ import {
   subShadowCss,
   type PlexPlayerPrefs,
 } from "../lib/plexPlayerPrefs";
-import { Ctrl, PanelHead } from "./plexPlayerControls";
+import { Ctrl, PanelHead, Skip10 } from "./plexPlayerControls";
 import { PlexPlayerSettings } from "./PlexPlayerSettings";
 import {
   useAutoSkip,
@@ -936,9 +936,19 @@ export default function PlexPlayer({ itemId, onClose, queue }: Props) {
         </div>
 
         <div className="flex items-center gap-3 text-white">
-          <Ctrl label={t("plex.player.playPause")} onClick={togglePlay} align="start">
+          <Ctrl
+            label={t("plex.player.rewind10")}
+            onClick={() => seekTo(absRef.current - 10)}
+            align="start"
+          >
+            <Skip10 dir="back" />
+          </Ctrl>
+          <Ctrl label={t("plex.player.playPause")} onClick={togglePlay}>
             {playing ? <Pause className="w-6 h-6" /> : <Play className="w-6 h-6" />}
           </Ctrl>
+          <Ctrl label={t("plex.player.forward10")} onClick={() => seekTo(absRef.current + 10)}>
+            <Skip10 dir="forward" />
+          </Ctrl>
           <Ctrl label={t("plex.player.restart")} onClick={() => seekTo(0)}>
             <RotateCcw className="w-5 h-5" />
           </Ctrl>

frontend/src/components/plexPlayerControls.tsx

@@ -1,6 +1,49 @@
 import { type ReactNode } from "react";
 import { RotateCcw } from "lucide-react";
 
+// ±10s skip glyph: an outline circular arrow with a "10" in the centre — the YouTube/Plex-native
+// muscle-memory shape. Deliberately distinct from the episode-level SkipBack/SkipForward (double
+// triangles) and from Restart's plain RotateCcw. The arrowhead is an L-corner at the arc's open end,
+// the same construction lucide uses for RotateCcw/RotateCw, so it sits consistently in the bar.
+export function Skip10({ dir }: { dir: "back" | "forward" }) {
+  const back = dir === "back";
+  return (
+    <svg
+      viewBox="0 0 24 24"
+      fill="none"
+      stroke="currentColor"
+      strokeWidth={2}
+      strokeLinecap="round"
+      strokeLinejoin="round"
+      className="w-6 h-6"
+      aria-hidden="true"
+    >
+      {back ? (
+        <>
+          <path d="M4 8.5 A8 8 0 1 1 4 12" />
+          <path d="M4 8.5 L4 4 M4 8.5 L8.5 8.5" />
+        </>
+      ) : (
+        <>
+          <path d="M20 8.5 A8 8 0 1 0 20 12" />
+          <path d="M20 8.5 L20 4 M20 8.5 L15.5 8.5" />
+        </>
+      )}
+      <text
+        x="12"
+        y="14.5"
+        textAnchor="middle"
+        fontSize="8"
+        fontWeight={700}
+        fill="currentColor"
+        stroke="none"
+      >
+        10
+      </text>
+    </svg>
+  );
+}
+
 // --- settings-panel building blocks ------------------------------------------------------------
 export function PanelHead({ children }: { children: ReactNode }) {
   return (

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

@@ -160,6 +160,8 @@
     "skipCredits": "Skip credits",
     "playPause": "Play / pause (space)",
     "restart": "Restart from beginning",
+    "rewind10": "Back 10 seconds",
+    "forward10": "Forward 10 seconds",
     "prev": "Previous episode",
     "next": "Next episode",
     "mute": "Mute (m)",

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

@@ -160,6 +160,8 @@
     "skipCredits": "Stáblista átugrása",
     "playPause": "Lejátszás / szünet (szóköz)",
     "restart": "Újra az elejéről",
+    "rewind10": "10 másodperc vissza",
+    "forward10": "10 másodperc előre",
     "prev": "Előző rész",
     "next": "Következő rész",
     "mute": "Némítás (m)",