Adjust macOS invisible subtitle vertical nudge

backlog/tasks/task-13 - Fix-macos-native-window-bounds-for-overlay-binding.md

@@ -5,7 +5,7 @@ status: Done
 assignee:
   - codex
 created_date: '2026-02-11 15:45'
-updated_date: '2026-02-11 16:20'
+updated_date: '2026-02-11 16:28'
 labels:
   - bug
   - macos
@@ -40,5 +40,5 @@ Follow-up in progress after packaged app runtime showed fullscreen fallback beha
 - Added `.asar` helper materialization to temp path so child process execution is possible if candidate path resolves inside asar.
 - Added throttled tracker logging for helper execution failures to expose runtime errors without log spam.
 - Updated Electron builder `extraResources` to ship `dist/scripts/get-mpv-window-macos` outside asar at `resources/scripts/get-mpv-window-macos`.
-- Added macOS-only invisible subtitle vertical nudge (`+4px`) in renderer layout to align interactive subtitles with mpv glyph baseline after bounds fix.
+- Added macOS-only invisible subtitle vertical nudge (`+5px`) in renderer layout to align interactive subtitles with mpv glyph baseline after bounds fix.
 <!-- SECTION:NOTES:END -->

src/renderer/positioning.ts

@@ -1,6 +1,8 @@
 import type { MpvSubtitleRenderMetrics, SubtitlePosition } from "../types";
 import type { ModalStateReader, RendererContext } from "./context";
 
+const INVISIBLE_MACOS_VERTICAL_NUDGE_PX = 5;
+
 function clampYPercent(yPercent: number): number {
   return Math.max(2, Math.min(80, yPercent));
 }
@@ -365,6 +367,16 @@ export function createPositioningController(
         ctx.dom.subtitleContainer.style.top = `${Math.max(0, currentTop - halfLeading)}px`;
       }
     }
+
+    if (ctx.platform.isMacOSPlatform) {
+      const currentBottom = parseFloat(ctx.dom.subtitleContainer.style.bottom);
+      if (Number.isFinite(currentBottom)) {
+        ctx.dom.subtitleContainer.style.bottom = `${Math.max(
+          0,
+          currentBottom + INVISIBLE_MACOS_VERTICAL_NUDGE_PX,
+        )}px`;
+      }
+    }
   }
 
   function applyInvisibleSubtitleLayoutFromMpvMetrics(