Add mac zip target so electron-updater gets latest-mac.yml (#8)

The v0.2.0 release succeeded (assets signed, notarized, uploaded) but was
missing `latest-mac.yml` — electron-builder only emits that manifest when
it builds a publishable macOS archive itself. With `target: dir` alone it
just hands us an unpacked .app and skips the manifest entirely, which
means every macOS user we ship to would never auto-update.

Fix: add `zip` as a second macOS target. electron-builder builds both in
one pass:
  - `dir` → feeds scripts/repack-dmg.sh for the human-facing styled DMG
  - `zip` → what electron-updater downloads at runtime; writes
            `latest-mac.yml` listing it + a matching `.blockmap` for
            delta updates

Upload glob in release.yml gets `*.zip` so the archive reaches the
Release page. README still points users at the DMG (zip is for the
updater, not humans).

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: beautyfree

.github/workflows/release.yml

@@ -159,6 +159,7 @@ jobs:
           draft: true
           files: |
             artifacts/*.dmg
+            artifacts/*.zip
             artifacts/*.exe
             artifacts/*.AppImage
             artifacts/*.deb

electron-builder.yml

@@ -39,10 +39,16 @@ mac:
   gatekeeperAssess: false
   entitlements: build-resources/entitlements.mac.plist
   entitlementsInherit: build-resources/entitlements.mac.plist
-  # Two-architecture fat binary. Drop `x64` if you only ship Apple Silicon.
+  # `dir` = unpacked .app bundle (consumed by scripts/repack-dmg.sh to produce
+  # the styled DMG humans download). `zip` = autoupdate transport — electron-
+  # updater downloads this at runtime and writes `latest-mac.yml` listing it.
+  # Without the zip target, electron-builder skips `latest-mac.yml` entirely
+  # and auto-updates silently break for macOS users.
   target:
     - target: dir
       arch: [arm64]
+    - target: zip
+      arch: [arm64]
 
 # Electron-builder's own DMG creation is disabled on macOS (see target: dir
 # above). scripts/repack-dmg.sh produces the styled, drag-to-Applications DMG