release: publish v2.0.21 responsive accessibility audit

Refine all primary views across supported desktop widths, preserve compact download actions, strengthen keyboard and assistive semantics, confirm irreversible actions, complete new bilingual UI strings, and unify live speed visualization colors.

src/renderer/views/downloads/DownloadsView.tsx

@@ -86,7 +86,7 @@ export function DownloadsSidebar({ actions, model }: { actions: DownloadsViewAct
     <aside className="downloads-sidebar" data-visual-region="downloads-sidebar">
       <div className="downloads-mode-title">Pakete</div>
       <SlidingSelection activeKey={model.filter} aria-label="Downloadfilter" as="nav" axis="vertical">
-        {filters.map((filter) => <button className={model.filter === filter.id ? "is-active" : ""} data-sliding-selection-active={model.filter === filter.id} data-sliding-selection-item="true" key={filter.id} onClick={() => actions.onFilterChange(filter.id)} type="button"><span>{filter.label}</span><b>{model.counts[filter.id]}</b></button>)}
+        {filters.map((filter) => <button aria-current={model.filter === filter.id ? "page" : undefined} className={model.filter === filter.id ? "is-active" : ""} data-sliding-selection-active={model.filter === filter.id} data-sliding-selection-item="true" key={filter.id} onClick={() => actions.onFilterChange(filter.id)} type="button"><span>{filter.label}</span><b>{model.counts[filter.id]}</b></button>)}
       </SlidingSelection>
       <label className="downloads-provider-filter"><span>Service</span><select aria-label="Service filtern" disabled={model.providerOptions.length <= 1} onChange={(event) => actions.onProviderFilterChange(event.target.value)} value={model.providerFilter}><option value="all">Alle Services</option>{model.providerOptions.map((provider) => <option key={provider.id} value={provider.id}>{provider.label}</option>)}</select></label>
       <label className="downloads-sidebar-search"><span>Downloads durchsuchen</span><input className="downloads-search-input" onChange={(event) => actions.onQueryChange(event.target.value)} placeholder="Paket, Datei oder Service" type="search" value={model.query} /></label>