Add playback source toggle (CDN/P2P) to video modal

- Added toggle buttons and stat counters to `video-modal.html`.
- Updated `VideoModal.js` to manage toggle visibility (show if either source exists, disable unavailable option) and dispatch `playback:switch-source` events.
- Updated `app.js` to handle source switching by restarting playback with a `forcedSource`.
- Updated `playbackService.js` to respect `forcedSource` by bypassing probe logic when a specific source is requested.

css/tailwind.generated.css

@@ -5,4 +5,4 @@
       --player-modal-inline-padding,clamp(var(--space-md),4vw,var(--space-xl-plus))
     );overflow:visible}#playerModal .watch-container.video-modal__similar{padding-inline:clamp(var(--space-3xs),.6vw,var(--space-2xs))}#playerModal .video-modal__primary>.watch-container:first-child{padding-block-start:var(--player-modal-vertical-padding)}#playerModal .video-modal__primary>.watch-container:last-child,#playerModal .video-modal__secondary>.watch-container:last-child{padding-block-end:var(--player-modal-vertical-padding)}#playerModal .modal-nav .watch-container{max-width:none;margin-inline:0}#playerModal .modal-info-panel{display:flex;flex-direction:column;gap:var(--space-md-plus)}#playerModal h2#videoTitle{margin:0;font-size:clamp(var(--font-size-xl),calc(var(--font-size-modal-title-base) + .5vw),var(--font-size-xl-plus));font-weight:600;line-height:1.3;color:var(--color-text);min-width:0;overflow-wrap:break-word;word-break:break-word}@media (min-width:1024px){.video-modal__headline #videoTitle.video-modal__title{flex:1 1 0%;min-width:0;max-width:calc(100% - var(--space-3xl) - var(--space-md))}.video-modal__headline .video-modal__status{flex:0 0 auto;max-width:clamp(var(--space-xl),25%,var(--space-3xl));margin-left:auto}}#playerModal .modal-meta{font-size:var(--font-size-sm);line-height:1.4;color:var(--color-text-muted)}#playerModal .modal-view-count{font-weight:600;color:var(--color-text)}#playerModal .channel-card{align-items:center;gap:var(--space-md);padding:var(--space-md) var(--space-lg)}#playerModal .channel-card,#playerModal .player-modal__module{display:flex;border-radius:var(--radius-xl);border:var(--border-width-hairline) solid var(--color-border-translucent);background-color:var(--color-surface);box-shadow:var(--shadow-sm)}#playerModal .player-modal__module{flex-direction:column;gap:clamp(var(--space-2xs),1vw,var(--space-sm));width:100%;padding:clamp(var(--space-xs),1vw,var(--space-sm))}#playerModal .player-modal__module-title{margin:0;font-size:var(--font-size-lg);font-weight:600;line-height:1.3;color:var(--color-text)}#playerModal .player-modal__module-list{display:flex;flex-direction:column;gap:var(--space-sm);width:100%;margin:0;padding:0;list-style:none}#playerModal .video-modal__similar .player-modal__module{gap:clamp(var(--space-3xs),.6vw,var(--space-xs));padding:clamp(var(--space-2xs),.6vw,var(--space-xs));border-width:0;box-shadow:none;background-color:transparent}#playerModal .video-modal__similar .player-modal__module-title{padding-inline:clamp(var(--space-3xs),.6vw,var(--space-2xs))}#playerModal .video-modal__similar .player-modal__module-list{gap:clamp(var(--space-3xs),.6vw,var(--space-xs));padding-inline:clamp(var(--space-3xs),.6vw,var(--space-2xs));padding-bottom:clamp(var(--space-3xs),.6vw,var(--space-2xs))}#playerModal .player-modal__module-scroll{max-height:clamp(var(--player-modal-module-scroll-min-height),calc(100vh - var(--player-modal-vertical-padding)*2 - var(--space-2xl)),var(--player-modal-module-scroll-max-height));overflow-y:auto;overflow-x:hidden;overscroll-behavior:contain;scrollbar-gutter:stable;padding-inline-end:var(--space-xs)}#playerModal .video-modal__similar .player-modal__module-scroll{max-height:none;overflow:visible;padding-inline-end:0;scrollbar-gutter:auto}#playerModal .player-modal__module-scroll>li{scroll-margin-block:var(--space-xs)}@media (max-width:30rem){#playerModal .modal-nav .icon-button{width:var(--space-xl);height:var(--space-xl);min-width:var(--space-xl);min-height:var(--space-xl)}#playerModal .watch-container{padding-inline:var(--space-sm)}#playerModal .channel-card{gap:var(--space-sm);padding:var(--space-sm) var(--space-md)}}#playerModal .channel-card__avatar{flex-shrink:0;width:var(--avatar-size-lg);height:var(--avatar-size-lg);border-radius:var(--radius-full);overflow:hidden;background-color:var(--color-border-subtle)}#playerModal .channel-card__avatar img{display:block;width:100%;height:100%;-o-object-fit:cover;object-fit:cover}#playerModal .channel-card__name{margin:0;font-size:var(--font-size-lg);font-weight:600;color:var(--color-text)}#playerModal .channel-card__npub{margin:0;font-size:var(--font-size-sm);color:var(--color-text-muted)}#playerModal .description-panel{padding:var(--space-md-plus) var(--space-lg);border-radius:var(--radius-xl);border:var(--border-width-hairline) solid var(--color-border-translucent);background-color:var(--color-surface);box-shadow:var(--shadow-sm)}#playerModal .description-panel p{margin:0;font-size:var(--font-size-sm);line-height:1.6;color:var(--color-text)}.player-modal__content{position:relative;z-index:var(--z-modal-content);display:flex;flex:1 1 auto;width:100%;min-height:100%;flex-direction:column;overflow:visible;padding:0;margin:0;border:none;border-radius:0;background-color:var(--color-surface);box-shadow:none}@media (prefers-reduced-motion:reduce){.player-modal__content{transition-property:none}}#playerModal .modal-nav{position:sticky;top:0;z-index:var(--z-overlay-nav);--tw-translate-y:0px;transform:translate(var(--tw-translate-x),var(--tw-translate-y)) rotate(var(--tw-rotate)) sLine truncated
         --player-modal-primary-inline-padding-lg,clamp(var(--space-sm),2.75vw,var(--space-lg))
-      )}}.revert-modal__layout{display:grid;gap:1.5rem}@media (min-width:1024px){.revert-modal__layout{grid-template-columns:minmax(var(--revert-modal-sidebar-min),var(--revert-modal-sidebar-width)) minmax(0,1fr)}}#playerModal.video-modal__primary{display:block}.video-modal__primary{display:flex;flex-direction:column;gap:1.5rem;min-width:0;min-height:0}#playerModal.video-modal__secondary{display:block}.video-modal__secondary{display:flex;flex-direction:column;gap:1rem;min-width:0;min-height:0;width:100%;align-self:stretch}.video-modal__similar{display:none}@media (min-width:1024px){#playerModal.video-modal__similar{display:block}.video-modal__similar{display:flex;flex-direction:column;gap:1.5rem;align-self:stretch;flex:1 1 auto;min-height:0}#playerModal .video-modal__similar .player-modal__module{height:100%;display:flex;flex:1 1 auto;min-height:0;flex-direction:column}#playerModal .video-modal__similar .player-modal__module-list{flex:1 1 auto;min-height:0}#playerModal .video-modal__similar .player-modal__module-scroll{height:100%;max-height:none;min-height:0}}#playerModal .player-modal__module-item{width:100%}#playerModal#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card){display:block}#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card){display:flex;width:100%;flex-direction:row;flex-wrap:nowrap;align-items:stretch;gap:var(--space-md)}#playerModal#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card){display:block}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card){display:flex;width:100%;flex-direction:row;flex-wrap:nowrap;align-items:stretch;gap:var(--space-md)}#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__media{width:clamp(var(--video-modal-item-media-min),18vw,var(--video-modal-item-media-max))}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__media{width:clamp(var(--video-modal-item-media-min),18vw,var(--video-modal-item-media-max))!important}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__media,#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__media{flex-shrink:0;overflow:hidden;border-radius:var(--radius-lg)}#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__content{padding:clamp(var(--space-sm),1.25vw,var(--space-md))}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__content{padding:clamp(var(--space-sm),1.25vw,var(--space-md))!important}#playerModal#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__content{display:block}#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__content{display:flex;min-width:0;flex:1 1 0%;flex-direction:column;gap:var(--space-sm)}#playerModal#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__content{display:block}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__content{display:flex;min-width:0;flex:1 1 0%;flex-direction:column;gap:var(--space-sm)}#playerModal#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__meta{display:block}#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__meta{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;font-size:var(--font-size-xs);line-height:var(--line-height-tight);color:var(--text-muted-strong)}#playerModal#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__meta{display:block}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__meta{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;font-size:var(--font-size-xs);line-height:var(--line-height-tight);color:var(--text-muted-strong)}#playerModal .video-modal__similar .player-modal__module-list{gap:clamp(var(--space-2xs),.85vw,var(--space-sm))}.player-modal__similar-card{outline:2px solid transparent;outline-offset:2px}.player-modal__similar-card:focus-visible{--tw-ring-offset-shadow:var(--tw-ring-inset) 0 0 0 var(--tw-ring-offset-width) var(--tw-ring-offset-color);--tw-ring-shadow:var(--tw-ring-inset) 0 0 0 calc(2px + var(--tw-ring-offset-width)) var(--tw-ring-color);box-shadow:var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow,0 0 #0000);--tw-ring-opacity:0.7;--tw-ring-offset-width:2px;--tw-ring-offset-color:var(--surface-base);transition-property:box-shadow;transition-timing-function:cubic-bezier(.4,0,.2,1);transition-duration:.15s;transition-duration:var(--motion-duration-fast);transition-timing-function:cubic-bezier(0,0,.2,1);--tw-ring-color:var(--color-accent)}#playerModal.player-modal__similar-card{display:block}.player-modal__similar-card{position:relative;displayLine truncated
+      )}}.revert-modal__layout{display:grid;gap:1.5rem}@media (min-width:1024px){.revert-modal__layout{grid-template-columns:minmax(var(--revert-modal-sidebar-min),var(--revert-modal-sidebar-width)) minmax(0,1fr)}}#playerModal.video-modal__primary{display:block}.video-modal__primary{display:flex;flex-direction:column;gap:1.5rem;min-width:0;min-height:0}#playerModal.video-modal__secondary{display:block}.video-modal__secondary{display:flex;flex-direction:column;gap:1rem;min-width:0;min-height:0;width:100%;align-self:stretch}.video-modal__similar{display:none}@media (min-width:1024px){#playerModal.video-modal__similar{display:block}.video-modal__similar{display:flex;flex-direction:column;gap:1.5rem;align-self:stretch;flex:1 1 auto;min-height:0}#playerModal .video-modal__similar .player-modal__module{height:100%;display:flex;flex:1 1 auto;min-height:0;flex-direction:column}#playerModal .video-modal__similar .player-modal__module-list{flex:1 1 auto;min-height:0}#playerModal .video-modal__similar .player-modal__module-scroll{height:100%;max-height:none;min-height:0}}#playerModal .player-modal__module-item{width:100%}#playerModal#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card){display:block}#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card){display:flex;width:100%;flex-direction:row;flex-wrap:nowrap;align-items:stretch;gap:var(--space-md)}#playerModal#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card){display:block}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card){display:flex;width:100%;flex-direction:row;flex-wrap:nowrap;align-items:stretch;gap:var(--space-md)}#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__media{width:clamp(var(--video-modal-item-media-min),18vw,var(--video-modal-item-media-max))}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__media{width:clamp(var(--video-modal-item-media-min),18vw,var(--video-modal-item-media-max))!important}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__media,#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__media{flex-shrink:0;overflow:hidden;border-radius:var(--radius-lg)}#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__content{padding:clamp(var(--space-sm),1.25vw,var(--space-md))}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__content{padding:clamp(var(--space-sm),1.25vw,var(--space-md))!important}#playerModal#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__content{display:block}#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__content{display:flex;min-width:0;flex:1 1 0%;flex-direction:column;gap:var(--space-sm)}#playerModal#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__content{display:block}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__content{display:flex;min-width:0;flex:1 1 0%;flex-direction:column;gap:var(--space-sm)}#playerModal#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__meta{display:block}#playerModal .player-modal__module-item>.card:not(.player-modal__similar-card) .video-card__meta{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;font-size:var(--font-size-xs);line-height:var(--line-height-tight);color:var(--text-muted-strong)}#playerModal#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__meta{display:block}#playerModal .player-modal__module-item>.\!card:not(.player-modal__similar-card) .video-card__meta{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;font-size:var(--font-size-xs);line-height:var(--line-height-tight);color:var(--text-muted-strong)}#playerModal .video-modal__similar .player-modal__module-list{gap:clamp(var(--space-2xs),.85vw,var(--space-sm))}.player-modal__similar-card{outline:2px solid transparent;outline-offset:2px}.player-modal__similar-card:focus-visible{--tw-ring-offset-shadow:var(--tw-ring-inset) 0 0 0 var(--tw-ring-offset-width) var(--tw-ring-offset-color);--tw-ring-shadow:var(--tw-ring-inset) 0 0 0 calc(2px + var(--tw-ring-offset-width)) var(--tw-ring-color);box-shadow:var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow,0 0 #0000);--tw-ring-opacity:0.7;--tw-ring-offset-width:2px;--tw-ring-offset-color:var(--surface-base);transition-property:box-shadow;transition-timing-function:cubic-bezier(.4,0,.2,1);transition-duration:.15s;transition-duration:var(--motion-duration-fast);transition-timing-function:cubic-bezier(0,0,.2,1);--tw-ring-color:var(--color-accent)}#playerModal.player-modal__similar-card{display:block}.player-modal__similar-card{position:relative;displayLine truncated