screenshare: fix inline per-call quality override being discarded

The Share control's inline quality dropdown sets a session-only
`share_quality_selection`, but ToggleScreenShare (which opens the audio
picker on the only real path to a share) unconditionally reset it back to
the saved config default before ConfirmShareScreen read it. The picker has
no quality control of its own, so the user's per-call pick was silently
dropped 100% of the time and every share used the persisted default.

Drop the reset; add a regression test asserting the override survives
picker-open and reaches the confirm.

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

src/app/mod.rs

@@ -1759,7 +1759,11 @@ fn update(state: &mut AppState, message: AppMessage) -> Task<AppMessage> {
                 // so the picker can't be reopened during the startup window.
                 state.share_picker_open = true;
                 state.share_audio_selection = None;
-                state.share_quality_selection = state.config.screen_share.quality;
+                // NB: do NOT reset `share_quality_selection` here. It is the
+                // per-call override set by the inline quality dropdown next to
+                // the Share button, and the picker has no quality control of its
+                // own — resetting it would silently discard the user's pick
+                // before `ConfirmShareScreen` reads it.
                 state.share_audio_apps.clear();
                 let _ = state.controller.send(CoreCommand::ListAudioApps);
             }
@@ -9271,6 +9275,42 @@ mod tests {
         assert!(!state.share_picker_open);
     }
 
+    #[test]
+    fn inline_quality_override_survives_opening_the_picker() {
+        // The inline quality dropdown (next to the Share button) sets a
+        // per-call `share_quality_selection`. Opening the audio picker via
+        // ToggleScreenShare must NOT reset it back to the saved config default,
+        // or the override the user just made is silently discarded before
+        // ConfirmShareScreen reads it into StartScreenShare.
+        use crate::config::ShareQuality;
+        let mut state = AppState::default();
+        // Saved default is Auto; the user picks a different per-call quality.
+        assert_eq!(state.config.screen_share.quality, ShareQuality::Auto);
+        let _ = update(
+            &mut state,
+            AppMessage::SelectShareQualityOverride(ShareQuality::High),
+        );
+        assert_eq!(state.share_quality_selection, ShareQuality::High);
+
+        // Clicking Share opens the picker — the override must be preserved.
+        let _ = update(&mut state, AppMessage::ToggleScreenShare);
+        assert!(state.share_picker_open);
+        assert_eq!(
+            state.share_quality_selection,
+            ShareQuality::High,
+            "opening the picker must not clobber the inline per-call override"
+        );
+
+        // Confirming reads that same override into the share start.
+        let _ = update(&mut state, AppMessage::ConfirmShareScreen);
+        assert!(state.share_starting);
+        assert_eq!(
+            state.share_quality_selection,
+            ShareQuality::High,
+            "the override the picker preserved must still be what ConfirmShareScreen sends"
+        );
+    }
+
     #[test]
     fn share_start_failure_clears_in_flight_flag() {
         // A failed spawn surfaces as UiEvent::Error (not ScreenShareStopped); the