diff --git a/Makefile b/Makefile
index 65908f9..663ee32 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-.PHONY: help deps build install build-linux build-macos build-macos-unsigned install-linux install-macos install-plugin uninstall uninstall-linux uninstall-macos print-dirs pretty ensure-pnpm generate-config generate-example-config docs-dev docs docs-preview
+.PHONY: help deps build install build-linux build-macos build-macos-unsigned install-linux install-macos install-plugin uninstall uninstall-linux uninstall-macos print-dirs pretty ensure-pnpm generate-config generate-example-config docs-dev docs docs-preview dev-start dev-start-macos dev-toggle dev-stop
 
 APP_NAME := subminer
 THEME_FILE := subminer.rasi
@@ -48,6 +48,10 @@ help:
 		"  build-linux      Build Linux AppImage" \
 		"  build-macos      Build macOS DMG/ZIP (signed if configured)" \
 		"  build-macos-unsigned Build macOS DMG/ZIP without signing/notarization" \
+		"  dev-start        Build and launch local Electron app" \
+		"  dev-start-macos  Build and launch local Electron app with macOS tracker backend" \
+		"  dev-toggle       Toggle overlay in a running local Electron app" \
+		"  dev-stop         Stop a running local Electron app" \
 		"  docs-dev         Run VitePress docs dev server" \
 		"  docs       Build VitePress static docs" \
 		"  docs-preview     Preview built VitePress docs" \
@@ -143,6 +147,20 @@ docs: ensure-pnpm
 docs-preview: ensure-pnpm
 	@pnpm run docs:preview
 
+dev-start: ensure-pnpm
+	@pnpm run build
+	@pnpm exec electron . --start
+
+dev-start-macos: ensure-pnpm
+	@pnpm run build
+	@pnpm exec electron . --start --backend macos
+
+dev-toggle: ensure-pnpm
+	@pnpm exec electron . --toggle
+
+dev-stop: ensure-pnpm
+	@pnpm exec electron . --stop
+
 
 install-linux:
 	@printf '%s\n' "[INFO] Installing Linux wrapper/theme artifacts"
diff --git a/backlog/tasks/task-13 - Fix-macos-native-window-bounds-for-overlay-binding.md b/backlog/tasks/task-13 - Fix-macos-native-window-bounds-for-overlay-binding.md
index d3414b6..f3f700b 100644
--- a/backlog/tasks/task-13 - Fix-macos-native-window-bounds-for-overlay-binding.md	
+++ b/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 16:28'
+updated_date: '2026-02-11 16:36'
 labels:
   - bug
   - macos
@@ -41,4 +41,5 @@ Follow-up in progress after packaged app runtime showed fullscreen fallback beha
 - 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 (`+5px`) in renderer layout to align interactive subtitles with mpv glyph baseline after bounds fix.
+- Increased macOS-only invisible subtitle line-height for multi-line text to improve separation as line count grows.
 <!-- SECTION:NOTES:END -->
diff --git a/backlog/tasks/task-18 - Add-remote-mac-mini-build-script.md b/backlog/tasks/task-18 - Add-remote-mac-mini-build-script.md
new file mode 100644
index 0000000..549f4be
--- /dev/null
+++ b/backlog/tasks/task-18 - Add-remote-mac-mini-build-script.md	
@@ -0,0 +1,41 @@
+---
+id: TASK-18
+title: Add remote mac mini build script
+status: Done
+assignee:
+  - codex
+created_date: '2026-02-11 16:48'
+updated_date: '2026-02-11 16:48'
+labels:
+  - build
+  - macos
+  - devex
+dependencies: []
+references:
+  - scripts/build-external.sh
+priority: medium
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Add a script that offloads macOS package builds to a remote Mac mini over SSH, then syncs release artifacts back to the local workspace.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 Script supports remote host and path configuration.
+- [x] #2 Script supports signed and unsigned macOS build modes.
+- [x] #3 Script syncs project sources to remote and copies release artifacts back locally.
+<!-- AC:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+Added `scripts/build-external.sh` with:
+- Defaults for host alias (`mac-mini`) and remote path (`~/build/SubMiner`)
+- Argument flags: `--host`, `--remote-path`, `--signed`, `--unsigned`, `--skip-sync`, `--sync-only`
+- Rsync-based upload excluding heavyweight build artifacts and local dependencies
+- Remote build execution (`pnpm run build:mac` or `pnpm run build:mac:unsigned`)
+- Artifact sync back into local `release/`
+<!-- SECTION:NOTES:END -->
diff --git a/src/renderer/positioning.ts b/src/renderer/positioning.ts
index 3751e81..3f9d8b1 100644
--- a/src/renderer/positioning.ts
+++ b/src/renderer/positioning.ts
@@ -2,6 +2,9 @@ import type { MpvSubtitleRenderMetrics, SubtitlePosition } from "../types";
 import type { ModalStateReader, RendererContext } from "./context";
 
 const INVISIBLE_MACOS_VERTICAL_NUDGE_PX = 5;
+const INVISIBLE_MACOS_LINE_HEIGHT_SINGLE = "0.92";
+const INVISIBLE_MACOS_LINE_HEIGHT_MULTI = "1.2";
+const INVISIBLE_MACOS_LINE_HEIGHT_MULTI_DENSE = "1.3";
 
 function clampYPercent(yPercent: number): number {
   return Math.max(2, Math.min(80, yPercent));
@@ -297,10 +300,10 @@ export function createPositioningController(
       "line-height",
       ctx.platform.isMacOSPlatform
         ? lineCount >= 3
-          ? "1.18"
+          ? INVISIBLE_MACOS_LINE_HEIGHT_MULTI_DENSE
           : multiline
-            ? "1.08"
-            : "0.86"
+            ? INVISIBLE_MACOS_LINE_HEIGHT_MULTI
+            : INVISIBLE_MACOS_LINE_HEIGHT_SINGLE
         : "normal",
       ctx.platform.isMacOSPlatform ? "important" : "",
     );