fix: gamepad input field navigation — exit at cursor edges

- Up/Down from input: try containers as fallback when spatial nav fails
- Left/Right from input: exit field when cursor is at start/end
  (e.g. Left from search bar at position 0 → category buttons)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

neode-ui/src/composables/useControllerNav.ts

@@ -246,14 +246,38 @@ export function useControllerNav(containerRef?: { value: HTMLElement | null }) {
         if (nearest) {
           focusEl(nearest)
         } else {
-          // Fallback: tab order when spatial navigation fails
-          const idx = all.indexOf(target)
-          const fallback = dir === 'down' ? all[idx + 1] : all[idx - 1]
-          if (fallback) focusEl(fallback)
+          // Spatial nav failed — try containers directly (e.g. search bar → first container)
+          const containers = getContainers()
+          const containerNearest = containers.length
+            ? findNearestInDirection(target, containers, dir)
+            : null
+          if (containerNearest) {
+            focusEl(containerNearest)
+          } else {
+            // Last fallback: tab order
+            const idx = all.indexOf(target)
+            const fallback = dir === 'down' ? all[idx + 1] : all[idx - 1]
+            if (fallback) focusEl(fallback)
+          }
         }
         return
       }
-      // Left/Right: stay in field (cursor movement). Escape: handled below.
+      // Left/Right: cursor movement in field, but exit at edges
+      if (e.key === 'ArrowLeft' || e.key === 'ArrowRight') {
+        const input = target as HTMLInputElement
+        const atStart = input.selectionStart === 0 && input.selectionEnd === 0
+        const atEnd = input.selectionStart === (input.value?.length ?? 0)
+        if ((e.key === 'ArrowLeft' && atStart) || (e.key === 'ArrowRight' && atEnd)) {
+          e.preventDefault()
+          const dir = e.key === 'ArrowLeft' ? 'left' as const : 'right' as const
+          const all = getFocusableElements(containerRef?.value ?? document)
+          const candidates = all.filter(el => el !== target)
+          const nearest = findNearestInDirection(target, candidates, dir)
+          if (nearest) focusEl(nearest)
+        }
+        return
+      }
+      // Other keys (Escape): handled below.
       if (e.key !== 'Escape') return
     }