Add .labui file association — open by double-click, cross-platform

Windows/Linux self-register via core/file_association.py (winreg /
XDG .desktop+mime), triggered from a new Settings button since there's
no installer to do it at install time. macOS gets it at build time via
labui.spec's new BUNDLE() step (CFBundleDocumentTypes in Info.plist) —
that step also makes mac builds a real .app bundle for the first time,
not just a bare onedir folder. main.py gains a LabUIApplication
subclass to catch the macOS QFileOpenEvent (buffered if it arrives
before MainWindow exists) plus argv[1] handling for Windows/Linux.
ProfileButton.load_path() extracted so both paths share the same
load-and-apply logic as the existing file-dialog flow.

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

1 files changed, 21 insertions, 0 deletions

diff --git a/labui.spec b/labui.spec
index 71d50dd..0fdbedc 100644
--- a/labui.spec
+++ b/labui.spec
@@ -81,3 +81,24 @@ coll = COLLECT(
     upx_exclude=[],
     name="LabUI",
 )
+
+# macOS: wrap the onedir output in a real .app bundle. Required for both a
+# double-clickable Finder app AND file association — CFBundleDocumentTypes
+# here is what tells Finder/LaunchServices that LabUI opens .labui files
+# (core/file_association.py doesn't need to do anything at runtime on this
+# platform, unlike Windows/Linux, because of this).
+if sys.platform == "darwin":
+    app = BUNDLE(
+        coll,
+        name="LabUI.app",
+        bundle_identifier="org.labui.LabUI",  # placeholder — swap for a real reverse-DNS id
+        info_plist={
+            "CFBundleDocumentTypes": [{
+                "CFBundleTypeName": "LabUI Profile",
+                "CFBundleTypeExtensions": ["labui"],
+                "CFBundleTypeRole": "Editor",
+                "LSHandlerRank": "Owner",
+            }],
+            "NSHighResolutionCapable": True,
+        },
+    )