feat(player): raise the playback speed ceiling off YouTube's limit

A single speed ladder fed both players, so the 2x cap that YouTube's
iframe API enforces also applied to Bunny and R2, which are plain <video>
elements the browser will play far faster. Pick the ladder per provider:
YouTube keeps 0.25x-2x, the native ones go up to 16x, where Chrome and
Firefox clamp playbackRate. The picker labels everything past 4x as
"no audio", since that is where the browsers stop pitch-correcting and
drop the audio track.

components/video-page/bunny-preview-player.tsx

@@ -21,6 +21,10 @@ import {
 } from '@/components/ui/dropdown-menu';
 import { resolvePublicBunnyCdnHostname } from '@/lib/bunny-cdn';
 import { cn } from '@/lib/utils';
+import {
+  NATIVE_SPEED_OPTIONS,
+  SILENT_ABOVE_SPEED,
+} from '@/components/video-page/hooks/video-player-utils';
 import type { BunnyPlaybackState, BunnyQualityOption } from '@/components/video-page/types';
 
 interface BunnyPreviewPlayerProps {
@@ -35,8 +39,6 @@ export interface BunnyPreviewPlayerHandle {
   toggleMute: () => void;
 }
 
-const SPEED_OPTIONS = [0.25, 0.5, 0.75, 1, 1.25, 1.5, 1.75, 2];
-
 function formatTime(value: number): string {
   if (!Number.isFinite(value) || value < 0) return '0:00';
   const total = Math.floor(value);
@@ -635,9 +637,14 @@ export const BunnyPreviewPlayer = forwardRef<BunnyPreviewPlayerHandle, BunnyPrev
                   </Button>
                 </DropdownMenuTrigger>
                 <DropdownMenuContent align="end">
-                  {SPEED_OPTIONS.map((speed) => (
+                  {NATIVE_SPEED_OPTIONS.map((speed) => (
                     <DropdownMenuItem key={speed} onClick={() => handleSpeedChange(speed)}>
                       {speed}x {speed === playbackSpeed ? '(Current)' : ''}
+                      {speed > SILENT_ABOVE_SPEED && (
+                        <span className="ml-auto pl-2 text-[10px] text-muted-foreground">
+                          no audio
+                        </span>
+                      )}
                     </DropdownMenuItem>
                   ))}
                 </DropdownMenuContent>

components/video-page/hooks/video-player-utils.ts

@@ -95,6 +95,23 @@ export function timeFromClientX(
   return percentage * duration;
 }
 
+// Speed ladders. YouTube is played through its iframe API, which silently
+// ignores any rate outside the list `getAvailablePlaybackRates()` returns, so
+// 2x is the ceiling there. Bunny and R2 are plain <video> elements, where the
+// ceiling is the browser's: Chrome and Firefox both clamp `playbackRate` at 16,
+// and setting more throws, so 16x is the top of the ladder.
+export const YOUTUBE_SPEED_OPTIONS = [0.25, 0.5, 0.75, 1, 1.25, 1.5, 1.75, 2];
+export const NATIVE_SPEED_OPTIONS = [0.25, 0.5, 0.75, 1, 1.25, 1.5, 1.75, 2, 2.5, 3, 4, 6, 8, 16];
+
+// Past 4x the browsers stop pitch-correcting and drop the audio track entirely.
+// The video still plays, so the fast rates are worth offering, but the picker
+// says so rather than letting a silent 8x read as a broken file.
+export const SILENT_ABOVE_SPEED = 4;
+
+export function getSpeedOptionsForProvider(providerId: string | null | undefined): number[] {
+  return providerId === 'youtube' ? YOUTUBE_SPEED_OPTIONS : NATIVE_SPEED_OPTIONS;
+}
+
 /**
  * Next or previous entry in the speed ladder, or `null` at either end. An
  * unknown current speed behaves like index -1, so stepping up lands on the

components/video-page/player-core.tsx

@@ -31,6 +31,7 @@ import {
   type AnnotationCanvasHandle,
   type AnnotationStroke,
 } from '@/components/annotation-canvas';
+import { SILENT_ABOVE_SPEED } from '@/components/video-page/hooks/video-player-utils';
 import type { BunnyQualityOption, CommentMarker } from '@/components/video-page/types';
 
 interface PlayerCoreProps {
@@ -453,9 +454,17 @@ export const PlayerCore = memo(function PlayerCore({
                   <DropdownMenuItem
                     key={speed}
                     onClick={() => handleSpeedChange(speed)}
-                    className={cn(speed === playbackSpeed && 'font-bold text-primary')}
+                    className={cn(
+                      'flex items-center justify-between gap-2',
+                      speed === playbackSpeed && 'font-bold text-primary'
+                    )}
                   >
                     {speed}x
+                    {speed > SILENT_ABOVE_SPEED && (
+                      <span className="text-[10px] font-normal text-muted-foreground">
+                        no audio
+                      </span>
+                    )}
                   </DropdownMenuItem>
                 ))}
               </DropdownMenuContent>