feat(client/windows): settings parity with the Apple client's revamp

Adopt the Apple client's 2026-07 settings structure so the two desktop
clients read the same way. Category map is now theirs verbatim -- General
(session/app behavior), Display (everything about the picture), Input,
Audio, Controllers, About -- which moves four things: statistics and the
game-library toggle out of Video/About into General, controllers out of
Input into their own category, and the codec/bitrate/HDR/decoder controls
out of the old Windows-only "Video" tab into Display, where Apple keeps
them. Sub-section headers (Resolution / Quality / Decoding / Host output)
mirror their Sections, as do the two "applies from the next session"
footers.

Every field now carries its explanation directly under it instead of only
in a hover tooltip -- the same move Apple made, for the same reason. The
old comment here argued against prose in the card because a paragraph
ABOVE a control reads as its label; that holds, so the caption goes below,
which is what Apple does and what Windows Settings itself does. Wording is
shared verbatim wherever a setting means the same thing on both platforms.
Where behavior differs the text stays Windows-specific -- notably the
forwarded-controller picker, where Apple forwards one pad as player 1 and
this client forwards every controller as its own player.

Two fixes fell out of the sweep: the decoder picker never offered D3D11VA
even though the chain accepts it (and 40030e90 made it Intel's default), and
settings opened on Display rather than the first sidebar item.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

clients/windows/src/app/mod.rs

@@ -241,7 +241,8 @@ fn root(cx: &mut RenderCx, ctx: &Arc<AppCtx>) -> Element {
     // reactor backend, so only a root `AsyncSetState` reliably re-renders the page.
     let (hover, set_hover) = cx.use_async_state(Option::<String>::None);
     // Which Settings section the NavigationView shows (persists across visits this run).
-    let (settings_nav, set_settings_nav) = cx.use_async_state("display".to_string());
+    // Opens on General — the first sidebar item, matching the Apple client's landing category.
+    let (settings_nav, set_settings_nav) = cx.use_async_state("general".to_string());
     // Connected-controller count, mirrored from the gamepad service by a poll thread
     // (thread-driven state must be root state — see the module docs). Drives the hosts
     // page's "Open console UI" hint; the compare in `call` makes the steady state free.