a11y: streamer-item row itself keyboard-accessible + aria-current

The previous a11y pass made all four chip-buttons inside a streamer
row (AUTO / VOD / REC / remove) keyboard-accessible, but the row
itself — the parent .streamer-item div whose click selects the
streamer — was still mouse-only. A keyboard user could focus the
chips but never the row, so they could never select a streamer
without a mouse.

Made the row a focusable role="button":
- role + tabindex on the .streamer-item div
- aria-label set to the streamer's name (so AT announces "xrohat
  button" rather than reading every chip child)
- aria-current="true" on the currently selected row (mirroring
  the visual .active state) so AT understands which row is the
  current selection
- A keydown handler on the row that fires selectStreamer on
  Enter / Space, but ONLY when the row itself (not a chip child)
  is the event target. The chips already preventDefault +
  stopPropagation on their own keydowns so they never reach this
  handler — and even if they did, the e.target check guards.

Focus-visible adds an inset 2px purple ring (inset to match the
row's left-border-marker styling for the active state). Tab order
through the sidebar is now: nav-items → streamer row → AUTO →
VOD → REC → remove-X → next streamer row.

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

src/renderer-streamers.ts

@@ -465,6 +465,14 @@ function renderStreamers(): void {
         item.className = 'streamer-item' + (currentStreamer === streamer ? ' active' : '');
         item.setAttribute('draggable', 'true');
         item.dataset.streamerName = streamer;
+        // Keyboard a11y for the row itself — click selects the streamer.
+        // Each chip inside still gets its own focus + Enter/Space wiring
+        // and stops propagation, so tabbing through a row lands on row
+        // first, then AUTO / VOD / REC / remove in order.
+        item.setAttribute('role', 'button');
+        item.setAttribute('tabindex', '0');
+        item.setAttribute('aria-label', streamer);
+        if (currentStreamer === streamer) item.setAttribute('aria-current', 'true');
 
         // Live-dot — red pulsing dot when this streamer is currently
         // broadcasting on Twitch. Populated from the live-status batch
@@ -573,6 +581,16 @@ function renderStreamers(): void {
             if (draggedStreamerName === streamer) return;
             void selectStreamer(streamer);
         });
+        item.addEventListener('keydown', (e) => {
+            // Activate row on Enter / Space when the row itself (not a
+            // chip child) is focused. The chips already preventDefault
+            // + stopPropagation on their own keydowns so they won't reach
+            // this handler.
+            if (e.key !== 'Enter' && e.key !== ' ') return;
+            if (e.target !== item) return;
+            e.preventDefault();
+            void selectStreamer(streamer);
+        });
         list.appendChild(item);
     });
 

src/styles.css

@@ -130,6 +130,11 @@ body {
     color: var(--text);
 }
 
+.streamer-item:focus-visible {
+    outline: none;
+    box-shadow: inset 0 0 0 2px rgba(145, 70, 255, 0.55);
+}
+
 .streamer-item.active {
     background: linear-gradient(90deg, rgba(145, 71, 255, 0.28) 0%, rgba(145, 71, 255, 0.08) 100%);
     color: var(--text);