chore(tui): /clean pass — inline one-off locals, tighten ConfirmPrompt

- providers.ts: drop the `dup` intermediate, fold the ternary inline
- paths.ts (fmtCwdBranch): inline `b` into the `tag` template
- prompts.tsx (ConfirmPrompt): hoist a single `lower = ch.toLowerCase()`,
  collapse the three early-return branches into two, drop the
  redundant bounds checks on arrow-key handlers (setSel is idempotent
  at 0/1), inline the `confirmLabel`/`cancelLabel` defaults at the
  use site
- modelPicker.tsx / config/env.ts / providers.test.ts: auto-formatter
  reflows picked up by `npm run fix`
- useInputHandlers.ts: drop the stray blank line that was tripping
  perfectionist/sort-imports (pre-existing lint error)

ui-tui/src/components/modelPicker.tsx

@@ -181,7 +181,10 @@ export function ModelPicker({ gw, onCancel, onSelect, sessionId, t }: ModelPicke
           const idx = off + i
 
           return (
-            <Text color={providerIdx === idx ? t.color.cornsilk : t.color.dim} key={providers[idx]?.slug ?? `row-${idx}`}>
+            <Text
+              color={providerIdx === idx ? t.color.cornsilk : t.color.dim}
+              key={providers[idx]?.slug ?? `row-${idx}`}
+            >
               {providerIdx === idx ? '▸ ' : '  '}
               {i + 1}. {row}
             </Text>
@@ -212,7 +215,10 @@ export function ModelPicker({ gw, onCancel, onSelect, sessionId, t }: ModelPicke
         const idx = off + i
 
         return (
-          <Text color={modelIdx === idx ? t.color.cornsilk : t.color.dim} key={`${provider?.slug ?? 'prov'}:${idx}:${row}`}>
+          <Text
+            color={modelIdx === idx ? t.color.cornsilk : t.color.dim}
+            key={`${provider?.slug ?? 'prov'}:${idx}:${row}`}
+          >
             {modelIdx === idx ? '▸ ' : '  '}
             {i + 1}. {row}
           </Text>

ui-tui/src/components/prompts.tsx

@@ -155,31 +155,21 @@ export function ConfirmPrompt({ onCancel, onConfirm, req, t }: ConfirmPromptProp
   const [sel, setSel] = useState(0)
 
   useInput((ch, key) => {
-    if (key.escape || (key.ctrl && ch.toLowerCase() === 'c')) {
-      onCancel()
-
-      return
-    }
-
     const lower = ch.toLowerCase()
 
+    if (key.escape || (key.ctrl && lower === 'c') || lower === 'n') {
+      return onCancel()
+    }
+
     if (lower === 'y') {
-      onConfirm()
-
-      return
+      return onConfirm()
     }
 
-    if (lower === 'n') {
-      onCancel()
-
-      return
-    }
-
-    if (key.upArrow && sel > 0) {
+    if (key.upArrow) {
       setSel(0)
     }
 
-    if (key.downArrow && sel < 1) {
+    if (key.downArrow) {
       setSel(1)
     }
 
@@ -189,12 +179,10 @@ export function ConfirmPrompt({ onCancel, onConfirm, req, t }: ConfirmPromptProp
   })
 
   const accent = req.danger ? t.color.error : t.color.warn
-  const confirmLabel = req.confirmLabel ?? 'Yes'
-  const cancelLabel = req.cancelLabel ?? 'No'
 
   const rows = [
-    { color: t.color.cornsilk, label: cancelLabel },
-    { color: req.danger ? t.color.error : t.color.cornsilk, label: confirmLabel }
+    { color: t.color.cornsilk, label: req.cancelLabel ?? 'No' },
+    { color: req.danger ? t.color.error : t.color.cornsilk, label: req.confirmLabel ?? 'Yes' }
   ]
 
   return (