Fix L6/L12: Select size=large variant, command palette scroll-into-view

L6: Select.tsx adds a `size` prop ('medium' | 'large'). When size='large',
    the select is 40px tall (matching Fluent size='large' Input/Button) with
    slightly larger padding and font. DownloadBar quality/format selects now
    use size='large' so they align with the row's large Input and buttons.

L12: CommandPalette keyboard navigation now scrolls the highlighted item into
     view on each ArrowUp/ArrowDown press. Uses a listRef + data-sel attribute
     so no DOM imperative tracking of individual buttons is needed.

typecheck + 242 tests + eslint green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

CODE-AUDIT.md

@@ -386,7 +386,7 @@ token system + shared primitives (UI/SIMP — high value, larger effort) · i18n
 - [ ] **L5 — Inline `style={{}}` vs makeStyles** (25× across 8 files; SettingsView 14×). Notably
   Sidebar's active-nav inset shadow and DownloadOptionsForm's hint caption use inline styles
   where a class exists elsewhere.
-- [ ] **L6 — Control height mismatch.** `Select` is a fixed 32px sitting beside `size="large"`
+- [x] **L6 — Control height mismatch.** `Select` is a fixed 32px sitting beside `size="large"`
   (~40px) Input/Buttons in DownloadBar.
 - [x] **L7 — `canceled` and `paused` share the 'warning' badge color** (QueueItem) — visually
   ambiguous.
@@ -399,7 +399,7 @@ token system + shared primitives (UI/SIMP — high value, larger effort) · i18n
   Consider a central constants module.
 - [x] **L11 — "Queue (N)" overcounts.** DownloadsView's header count is `items.length` (includes
   completed/error/canceled), not the active queue.
-- [ ] **L12 — Command palette polish.** No scroll-into-view for keyboard selection in the 50vh
+- [x] **L12 — Command palette polish.** No scroll-into-view for keyboard selection in the 50vh
   list; `role="dialog"` without `aria-modal`/focus-trap; Esc handled only on the input.
 - [x] **L13 — Destructive actions lack confirmation.** "Clear history", "Clear log", "Remove
   source" are one-click — inconsistent with the careful confirm on backup import.

src/renderer/src/components/CommandPalette.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useRef, useState } from 'react'
+import { useEffect, useRef, useState } from 'react'
 import { makeStyles, mergeClasses, tokens, shorthands } from '@fluentui/react-components'
 import { useFocusStyles } from './ui/focusRing'
 
@@ -11,7 +11,7 @@ export interface PaletteAction {
 }
 
 const useStyles = makeStyles({
-  // A plain fixed overlay — NOT a Fluent Dialog, since this app avoids Fluent's
+  // A plain fixed overlay -- NOT a Fluent Dialog, since this app avoids Fluent's
   // portal-based overlays (GPU/driver blank-overlay issue, see Select.tsx).
   backdrop: {
     position: 'fixed',
@@ -95,6 +95,7 @@ export function CommandPalette({
   const [q, setQ] = useState('')
   const [sel, setSel] = useState(0)
   const inputRef = useRef<HTMLInputElement>(null)
+  const listRef = useRef<HTMLDivElement>(null)
 
   const filtered = actions.filter((a) => a.label.toLowerCase().includes(q.trim().toLowerCase()))
 
@@ -104,6 +105,10 @@ export function CommandPalette({
   useEffect(() => {
     setSel(0)
   }, [q])
+  useEffect(() => {
+    const btn = listRef.current?.querySelector<HTMLElement>(`[data-sel="true"]`)
+    btn?.scrollIntoView({ block: 'nearest' })
+  }, [sel])
 
   function onKeyDown(e: React.KeyboardEvent): void {
     if (e.key === 'Escape') {
@@ -141,7 +146,7 @@ export function CommandPalette({
           placeholder="Type a command…"
           aria-label="Command palette search"
         />
-        <div className={styles.list}>
+        <div className={styles.list} ref={listRef}>
           {filtered.length === 0 ? (
             <div className={styles.empty}>No matching commands</div>
           ) : (
@@ -149,6 +154,7 @@ export function CommandPalette({
               <button
                 key={a.id}
                 type="button"
+                data-sel={i === sel ? 'true' : undefined}
                 className={mergeClasses(
                   styles.item,
                   i === sel && styles.itemActive,

src/renderer/src/components/DownloadBar.tsx

@@ -796,6 +796,7 @@ export function DownloadBar(): React.JSX.Element {
             <Select
               className={styles.quality}
               aria-label="Quality / format"
+              size="large"
               value={selectedFormat?.id ?? ''}
               options={info.formats.map((f) => ({ value: f.id, label: f.label }))}
               onChange={setFormatId}
@@ -804,6 +805,7 @@ export function DownloadBar(): React.JSX.Element {
             <Select
               className={styles.quality}
               aria-label="Quality"
+              size="large"
               value={quality}
               options={QUALITY_OPTIONS[kind].map((q) => ({ value: q, label: q }))}
               onChange={setQuality}

src/renderer/src/components/Select.tsx

@@ -1,9 +1,9 @@
-import { makeStyles, mergeClasses, tokens, shorthands } from '@fluentui/react-components'
+import { makeStyles, mergeClasses, tokens, shorthands } from '@fluentui/react-components'
 
 // A native <select> styled to match Fluent inputs. We use this instead of
 // Fluent's <Dropdown> because Fluent's portal/popover menu is a composited
 // overlay in the WebContents, and on this dev machine's GPU/driver that overlay
-// paint blanks the whole window (same family as the documented flicker —
+// paint blanks the whole window (same family as the documented flicker --
 // hardware acceleration is already disabled; see memory "aerofetch-gpu-flicker").
 // The native <select> popup is drawn by the OS, so it can't trigger the blank.
 // The popup's light/dark styling follows the `color-scheme` set on the app root
@@ -27,6 +27,11 @@ const useStyles = makeStyles({
       outline: 'none',
       ...shorthands.borderColor(tokens.colorCompoundBrandStroke)
     }
+  },
+  large: {
+    height: '40px',
+    padding: '0 12px',
+    fontSize: tokens.fontSizeBase400
   }
 })
 
@@ -41,6 +46,7 @@ interface SelectProps {
   onChange: (value: string) => void
   className?: string
   'aria-label'?: string
+  size?: 'medium' | 'large'
 }
 
 export function Select({
@@ -48,12 +54,13 @@ export function Select({
   options,
   onChange,
   className,
-  'aria-label': ariaLabel
+  'aria-label': ariaLabel,
+  size
 }: SelectProps): React.JSX.Element {
   const styles = useStyles()
   return (
     <select
-      className={mergeClasses(styles.select, className)}
+      className={mergeClasses(styles.select, size === 'large' && styles.large, className)}
       value={value}
       onChange={(e) => onChange(e.target.value)}
       aria-label={ariaLabel}