fix(tv): Alphabet-Sidebar per D-Pad/Fernbedienung navigierbar

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

video-konverter/app/static/tv/js/tv.js

@@ -36,9 +36,9 @@ class FocusManager {
                     el => el.classList.remove("input-editing"));
             }
             if (e.target && e.target.hasAttribute && e.target.hasAttribute("data-focusable")) {
-                if (!e.target.closest("#tv-nav")) {
+                if (!e.target.closest("#tv-nav") && !e.target.closest(".tv-alpha-sidebar")) {
-                    // Nur echte Content-Elemente merken (nicht Filter/Controls)
+                    // Nur echte Content-Elemente merken (nicht Nav/Sidebar)
-                    if (e.target.closest(".tv-grid, .tv-list-compact, .tv-detail-list, .tv-folder-view, .tv-row, .tv-episode-list, .tv-episode-grid, .tv-tabs, .tv-detail-actions, .tv-alpha-sidebar, .tv-view-switch, .tv-filter-bar, .tv-season-actions, .profiles-grid")) {
+                    if (e.target.closest(".tv-grid, .tv-list-compact, .tv-detail-list, .tv-folder-view, .tv-row, .tv-episode-list, .tv-episode-grid, .tv-tabs, .tv-detail-actions, .tv-view-switch, .tv-filter-bar, .tv-season-actions, .profiles-grid")) {
                         this._lastContentFocus = e.target;
                     }
                 }
@@ -229,6 +229,70 @@ class FocusManager {
             }
         }
 
+        // ===== Alphabet-Sidebar Navigation =====
+        const inSidebar = active.closest(".tv-alpha-sidebar");
+
+        if (inSidebar) {
+            if (direction === "ArrowLeft") {
+                // Zurueck zum Content
+                if (this._lastContentFocus && document.contains(this._lastContentFocus)) {
+                    this._lastContentFocus.focus();
+                } else {
+                    const firstCard = document.querySelector(".tv-grid [data-focusable], .tv-card[data-focusable]");
+                    if (firstCard) firstCard.focus();
+                }
+                e.preventDefault();
+                return;
+            }
+            if (direction === "ArrowUp" || direction === "ArrowDown") {
+                // Sequentiell durch Buchstaben
+                const letters = Array.from(document.querySelectorAll(".tv-alpha-letter[data-focusable]"))
+                    .filter(el => el.offsetHeight > 0);
+                const idx = letters.indexOf(active);
+                const next = direction === "ArrowDown" ? idx + 1 : idx - 1;
+                if (next >= 0 && next < letters.length) {
+                    letters[next].focus();
+                    letters[next].scrollIntoView({ block: "nearest", behavior: "smooth" });
+                }
+                e.preventDefault();
+                return;
+            }
+        }
+
+        // ArrowRight am rechten Grid-Rand -> Sidebar
+        if (!inNav && !inSidebar && direction === "ArrowRight") {
+            const sidebar = document.getElementById("alpha-sidebar");
+            if (sidebar && sidebar.offsetHeight > 0) {
+                // Pruefen ob es noch ein Element rechts im Content gibt
+                const contentEls = focusables.filter(el => !el.closest("#tv-nav") && !el.closest(".tv-alpha-sidebar"));
+                const currentRect_r = active.getBoundingClientRect();
+                const rightNeighbor = contentEls.some(el => {
+                    const r = el.getBoundingClientRect();
+                    return r.left > currentRect_r.right + 5 && Math.abs(r.top - currentRect_r.top) < 100;
+                });
+                if (!rightNeighbor) {
+                    // Kein Content rechts -> zur Sidebar springen
+                    const sidebarLetters = Array.from(sidebar.querySelectorAll("[data-focusable]"))
+                        .filter(el => el.offsetHeight > 0);
+                    if (sidebarLetters.length > 0) {
+                        // Naechstgelegenen Buchstaben vertikal finden
+                        const cy_r = currentRect_r.top + currentRect_r.height / 2;
+                        let best = sidebarLetters[0];
+                        let bestDist_r = Infinity;
+                        sidebarLetters.forEach(l => {
+                            const lr = l.getBoundingClientRect();
+                            const d = Math.abs(lr.top + lr.height / 2 - cy_r);
+                            if (d < bestDist_r) { bestDist_r = d; best = l; }
+                        });
+                        this._lastContentFocus = active;
+                        best.focus();
+                        e.preventDefault();
+                        return;
+                    }
+                }
+            }
+        }
+
         // Naechstes Element in Richtung finden (Nearest-Neighbor)
         const currentRect = active.getBoundingClientRect();
         const cx = currentRect.left + currentRect.width / 2;
@@ -240,7 +304,7 @@ class FocusManager {
         // Nur Elemente im gleichen Bereich (Nav oder Content) bevorzugen
         const searchEls = inNav
             ? focusables.filter(el => el.closest("#tv-nav"))
-            : focusables.filter(el => !el.closest("#tv-nav"));
+            : focusables.filter(el => !el.closest("#tv-nav") && !el.closest(".tv-alpha-sidebar"));
 
         for (const el of searchEls) {
             if (el === active) continue;