a11y: aria-label on the 3 icon-only buttons in the main shell

Three icon-only buttons in the always-visible UI had no programmatic accessible name:
- the "+" add-streamer button (no id, no title, no aria-label — entire button was unnamed)
- the bulk-remove X button next to the Streamer section title (had a localized title, but title is not a reliable accessible-name source — many screen readers don't expose it)
- the VOD-filter clear X button above the VOD grid (same — title-only)

For all three the visible text is just a glyph ("+", "x"), so the accessible name has to come from somewhere else. Added:
- new locale key static.streamerAddAriaLabel ("Streamer hinzufuegen" / "Add streamer") and an id on the "+" button so renderer-texts can localize it
- new setAriaLabel(id, value) helper in renderer-texts mirroring the existing setTitle/setPlaceholder pattern
- aria-label calls for all three buttons, in addition to the existing title (so the tooltip stays for sighted users)

The two existing X buttons reuse their existing title strings as aria-label — no new translation work, just exposing the already-present text via the right ARIA attribute.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/index.html

@@ -248,7 +248,7 @@
                 <div class="header-actions">
                     <div class="header-search">
                         <input type="text" id="newStreamer" placeholder="Streamer hinzufugen..." onkeypress="if(event.key==='Enter')addStreamer()">
-                        <button onclick="addStreamer()">+</button>
+                        <button id="btnAddStreamer" type="button" onclick="addStreamer()" aria-label="Add streamer" title="Add streamer">+</button>
                     </div>
                     <button class="btn-icon" onclick="refreshVODs()">
                         <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor"><path d="M17.65 6.35C16.2 4.9 14.21 4 12 4c-4.42 0-7.99 3.58-7.99 8s3.57 8 7.99 8c3.73 0 6.84-2.55 7.73-6h-2.08c-.82 2.33-3.04 4-5.65 4-3.31 0-6-2.69-6-6s2.69-6 6-6c1.66 0 3.14.69 4.22 1.78L13 11h7V4l-2.35 2.35z"/></svg>

src/renderer-locale-de.ts

@@ -177,6 +177,7 @@ const UI_TEXT_DE = {
         downloadPathNotWritable: 'Download-Ordner ist nicht beschreibbar. Waehle einen anderen Ordner oder pruefe die Schreibrechte.',
         streamerSectionTitle: 'Streamer',
         streamerListFilterPlaceholder: 'Filtern...',
+        streamerAddAriaLabel: 'Streamer hinzufuegen',
         streamerBulkRemoveTitle: 'Alle entfernen (oder gefilterte)',
         streamerBulkRemoveAll: 'Alle {count} Streamer aus der Liste entfernen?',
         streamerBulkRemoveFiltered: 'Die {count} passenden Streamer aus der Liste entfernen?',

src/renderer-locale-en.ts

@@ -177,6 +177,7 @@ const UI_TEXT_EN = {
         downloadPathNotWritable: 'Download folder is not writable. Pick another folder or grant write permission.',
         streamerSectionTitle: 'Streamer',
         streamerListFilterPlaceholder: 'Filter...',
+        streamerAddAriaLabel: 'Add streamer',
         streamerBulkRemoveTitle: 'Remove all (or filtered)',
         streamerBulkRemoveAll: 'Remove all {count} streamers from the list?',
         streamerBulkRemoveFiltered: 'Remove the {count} matching streamer(s) from the list?',

src/renderer-texts.ts

@@ -42,6 +42,11 @@ function setTitle(id: string, value: string): void {
     if (node) node.setAttribute('title', value);
 }
 
+function setAriaLabel(id: string, value: string): void {
+    const node = document.getElementById(id);
+    if (node) node.setAttribute('aria-label', value);
+}
+
 function setLanguage(lang: string): LanguageCode {
     currentLanguage = lang === 'en' ? 'en' : 'de';
     UI_TEXT = UI_TEXTS[currentLanguage];
@@ -176,6 +181,9 @@ function applyLanguageToStaticUI(): void {
     setText('streamerSectionTitleText', UI_TEXT.static.streamerSectionTitle);
     setPlaceholder('streamerListFilter', UI_TEXT.static.streamerListFilterPlaceholder);
     setTitle('btnStreamerBulkRemove', UI_TEXT.static.streamerBulkRemoveTitle);
+    setAriaLabel('btnStreamerBulkRemove', UI_TEXT.static.streamerBulkRemoveTitle);
+    setAriaLabel('btnAddStreamer', UI_TEXT.static.streamerAddAriaLabel);
+    setTitle('btnAddStreamer', UI_TEXT.static.streamerAddAriaLabel);
     setText('metadataCacheMinutesLabel', UI_TEXT.static.metadataCacheMinutesLabel);
     setText('filenameTemplatesTitle', UI_TEXT.static.filenameTemplatesTitle);
     setText('vodTemplateLabel', UI_TEXT.static.vodTemplateLabel);
@@ -282,6 +290,7 @@ function applyLanguageToStaticUI(): void {
     setPlaceholder('newStreamer', UI_TEXT.static.streamerPlaceholder);
     setPlaceholder('vodFilterInput', UI_TEXT.vods.filterPlaceholder);
     setTitle('vodFilterClearBtn', UI_TEXT.vods.filterClearTitle);
+    setAriaLabel('vodFilterClearBtn', UI_TEXT.vods.filterClearTitle);
     setText('vodSortLabel', UI_TEXT.vods.sortLabel);
     if (typeof refreshVodSortSelectLabels === 'function') {
         refreshVodSortSelectLabels();