Add the cockpit seat and hand steering to the Quest launcher

The Quest launcher's Settings > VR gains a Seat choice (cockpit or
custom, first_person_seat) and a Hand steering switch (hand_steering, off
by default like the runtime), which is only enabled in the first-person
cockpit because the wheel belongs to that seat. About credits heurazy for
the turning steering wheel and hand steering. The runtime side was already
shared with the Quest build.

OPENXR.md records what one Quest 3 race showed: the kart's own wheel
animated (228 draws a frame) with the race camera's view matching the
scene's exactly, but the driver's eye was never calibrated and the
fallback put the wheel centre about 13 cm above eye level. The Quest
declares no hand-tracking permission, so hands are the procedural gloves.

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

android/app/src/main/java/org/wiicompiled/quest/launcher/SettingsPage.kt

@@ -115,6 +115,8 @@ class SettingsPage(
 
     private fun buildVr() {
         val firstPerson = { c: TomlConfig -> c.bool("vr", "first_person") ?: false }
+        // The steering wheel and hand steering belong to the cockpit seat.
+        val cockpit = { c: TomlConfig -> firstPerson(c) && stringIndex(c, "vr", "first_person_seat", SEATS) == 0 }
         section(R.string.section_vr_camera) {
             choice(
                 R.string.vr_camera, R.string.vr_camera_helper,
@@ -151,6 +153,20 @@ class SettingsPage(
                 },
                 enabledIf = firstPerson,
             )
+            choice(
+                R.string.vr_seat, R.string.vr_seat_helper,
+                listOf(R.string.vr_seat_cockpit, R.string.vr_seat_custom),
+                read = { stringIndex(it, "vr", "first_person_seat", SEATS) },
+                write = { c, index -> c.setString("vr", "first_person_seat", SEATS[index]) },
+                enabledIf = firstPerson,
+            )
+            // heurazy's grab-and-turn wheel: runtime_config.h's kVrHandSteeringDefault is off.
+            toggle(
+                R.string.vr_hand_steering, R.string.vr_hand_steering_helper,
+                read = { it.bool("vr", "hand_steering") ?: false },
+                write = { c, value -> c.setBool("vr", "hand_steering", value) },
+                enabledIf = cockpit,
+            )
             slider(
                 R.string.vr_lean_back, R.string.vr_lean_back_helper, -45.0, 45.0, 1.0,
                 read = { number(it, "vr", "lean_back_degrees", -45.0, 45.0, 0.0) },
@@ -366,6 +382,7 @@ class SettingsPage(
         }
         section(R.string.section_about_credits) {
             info(R.string.about_credit_title_vr, activity.getString(R.string.about_credit_vr), stacked = true)
+            info(R.string.about_credit_title_hand_steering, activity.getString(R.string.about_credit_hand_steering), stacked = true)
             info(R.string.about_credit_title_wiicompiled, activity.getString(R.string.about_credit_wiicompiled), stacked = true)
             info(R.string.about_credit_title_retro_rewind, activity.getString(R.string.about_credit_retro_rewind), stacked = true)
             info(R.string.about_credit_title_wheel_wizard, activity.getString(R.string.about_credit_wheel_wizard), stacked = true)
@@ -686,6 +703,8 @@ class SettingsPage(
 
     private companion object {
         val ROTATIONS = listOf("yaw", "yaw_pitch", "full")
+        // The runtime's default ("cockpit") first.
+        val SEATS = listOf("cockpit", "custom")
         // The runtime's default ("boost") first: an absent key reads as index 0.
         val PERFORMANCE_LEVELS = listOf("boost", "sustained_high", "sustained_low", "power_savings", "default")
         val CONTROLLER_MODES = listOf("wii_remote", "gamepad")

android/app/src/main/res/values/strings.xml

@@ -141,6 +141,7 @@
     <string name="about_app_name">WiiCompiled OpenXR VR</string>
     <string name="about_app_summary">Mario Kart Wii recompiled to native code, with an OpenXR renderer, running on this headset. No game code and no game data come with it: each game is built from the disc you own.</string>
     <string name="about_credit_vr">Meta Quest port and the OpenXR VR renderer by iChris4.</string>
+    <string name="about_credit_hand_steering">The cockpit\'s turning steering wheel and hand steering by heurazy, from mario-kart-wii-VR-port (GPL v3).</string>
     <string name="about_credit_wiicompiled">WiiCompiled, the static recompilation this is built on, by patchzyy and the static recompilation community.</string>
     <string name="about_credit_retro_rewind">Retro Rewind by ZPL and team, the mod distribution this app can download and play.</string>
     <string name="about_credit_wheel_wizard">Wheel Wizard by Patchzy and WantToBeeMe, the PC launcher this panel is modelled on.</string>
@@ -153,6 +154,7 @@
     <string name="about_licence_text">GNU General Public License v3. Not affiliated with, endorsed by, or associated with Nintendo. Mario Kart Wii is a trademark of Nintendo.</string>
     <string name="about_kit">Game kit</string>
     <string name="about_credit_title_vr">Meta Quest and VR</string>
+    <string name="about_credit_title_hand_steering">Steering wheel and hand steering</string>
     <string name="about_credit_title_wiicompiled">WiiCompiled</string>
     <string name="about_credit_title_retro_rewind">Retro Rewind</string>
     <string name="about_credit_title_wheel_wizard">Wheel Wizard</string>
@@ -184,6 +186,12 @@
     <string name="vr_hide_nothing">Nothing</string>
     <string name="vr_hide_driver">Driver</string>
     <string name="vr_hide_driver_and_kart">Driver and kart</string>
+    <string name="vr_seat">Seat</string>
+    <string name="vr_seat_helper">The cockpit puts you at the driver\'s eyes, life-size, with the steering wheel or handlebar turning within reach. Custom uses the head offsets from the in-headset settings.</string>
+    <string name="vr_seat_cockpit">Cockpit</string>
+    <string name="vr_seat_custom">Custom</string>
+    <string name="vr_hand_steering">Hand steering</string>
+    <string name="vr_hand_steering_helper">In the cockpit, squeeze a grip near the steering wheel or handlebar to grab it, and turn it to steer. Releasing both grips gives steering back to the stick. Hand steering by heurazy.</string>
     <string name="vr_lean_back">Lean back angle</string>
     <string name="vr_lean_back_helper">Tilts the race view back for playing reclined. 0 applies no tilt.</string>