refactor(frontend): extract logic to hooks, split inline components

Area 1 (tv/page.tsx 964→423 lines):
- hooks: use-fullscreen, use-idle, use-volume, use-quality, use-subtitles,
  use-channel-input, use-channel-passwords, use-tv-keyboard
- components: SubtitlePicker, VolumeControl, QualityPicker, TopControlBar,
  LogoWatermark, AutoplayPrompt, ChannelNumberOverlay, TvBaseLayer

Area 2 (edit-channel-sheet.tsx 1244→678 lines):
- hooks: use-channel-form (all form state + reset logic)
- lib/schemas.ts: extracted Zod schemas + extractErrors
- components: AlgorithmicFilterEditor, RecyclePolicyEditor, WebhookEditor,
  AccessSettingsEditor, LogoEditor

Area 3 (dashboard/page.tsx 406→261 lines):
- hooks: use-channel-order, use-import-channel, use-regenerate-all
- lib/channel-export.ts: pure export utility
- components: DashboardHeader

k-tv-frontend/hooks/use-regenerate-all.ts

@@ -0,0 +1,34 @@
+"use client";
+
+import { useState } from "react";
+import { useQueryClient } from "@tanstack/react-query";
+import { toast } from "sonner";
+import { api } from "@/lib/api";
+import type { ChannelResponse } from "@/lib/types";
+
+export function useRegenerateAllSchedules(
+  channels: ChannelResponse[] | undefined,
+  token: string | null,
+) {
+  const queryClient = useQueryClient();
+  const [isRegeneratingAll, setIsRegeneratingAll] = useState(false);
+
+  const handleRegenerateAll = async () => {
+    if (!token || !channels || channels.length === 0) return;
+    setIsRegeneratingAll(true);
+    let failed = 0;
+    for (const ch of channels) {
+      try {
+        await api.schedule.generate(ch.id, token);
+        queryClient.invalidateQueries({ queryKey: ["schedule", ch.id] });
+      } catch {
+        failed++;
+      }
+    }
+    setIsRegeneratingAll(false);
+    if (failed === 0) toast.success(`All ${channels.length} schedules regenerated`);
+    else toast.error(`${failed} schedule(s) failed to generate`);
+  };
+
+  return { isRegeneratingAll, handleRegenerateAll };
+}