fix: call obsidian binary directly instead of xdg-open for URI handling

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/router.py

@@ -224,15 +224,14 @@ async def open_file(body: dict, user: dict = Depends(current_user)):
         cfg = load_config()
         vault = cfg.get("obsidian", {}).get("vault", "").strip()
         open_target = paths[0]
-        for p in paths:
         if vault and os.path.isdir(vault):
+            for p in paths:
                 dest = os.path.join(vault, os.path.basename(p))
                 shutil.copy2(p, dest)
-                if p == paths[0]:
-                    open_target = dest
-            else:
-                open_target = p
-        subprocess.Popen(["xdg-open", f"obsidian://open?path={quote(open_target, safe='/')}"])
+            open_target = os.path.join(vault, os.path.basename(paths[0]))
+        uri = f"obsidian://open?path={quote(open_target, safe='/')}"
+        obsidian_bin = shutil.which("obsidian") or "/usr/bin/obsidian"
+        subprocess.Popen([obsidian_bin, uri])
     elif mode == "folder" and shutil.which("dolphin"):
         subprocess.Popen(["dolphin", "--select", paths[0]])
     elif mode == "folder":