fix: Linux dialog deadlock + Chinese encoding + QR/notify fallbacks

- Use tk.Toplevel instead of CTkToplevel on Linux for transfer request,
  peer selection, and zip progress dialogs (same fix as macOS commit c324611)
- Read clipboard via NSPasteboard ctypes bridge for guaranteed UTF-8 on macOS
- Add _safe_decode() with CJK encoding fallback chain for history previews
- Fix HTML preview: strip style/script blocks, comments, unescape entities
- Fix QR code not rendering on Linux: convert qrcode image to RGB
- Fix notifications on Linux: catch NotImplementedError, fall back to notify-send
- Make root window transparent instead of withdrawn on Linux (fixes window restore)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: kai3316

internal/clipboard/clipboard_darwin.py

@@ -292,6 +292,14 @@ def read(self) -> ClipboardContent:
     # -- text / html / rtf via pbpaste (no TCC issues) ---------------------
 
     def _get_text(self) -> bytes:
+        # Prefer ctypes NSPasteboard → public.utf8-plain-text (guaranteed UTF-8).
+        # pbpaste -Prefer txt can return bytes in a legacy encoding (e.g. GBK)
+        # for CJK text, producing garbled characters when decoded as UTF-8.
+        data = _pb_data_for_type(b"public.utf8-plain-text")
+        if data:
+            return data
+
+        # Fallback: pbpaste
         try:
             result = subprocess.run(
                 ["pbpaste", "-Prefer", "txt"],

internal/clipboard/history.py

@@ -33,9 +33,33 @@
 }
 
 
+def _safe_decode(data: bytes) -> str:
+    """Decode bytes to string, trying common encodings."""
+    try:
+        return data.decode("utf-8")
+    except UnicodeDecodeError:
+        pass
+    for enc in ("gbk", "gb2312", "gb18030", "big5", "shift-jis", "euc-kr"):
+        try:
+            return data.decode(enc)
+        except (UnicodeDecodeError, UnicodeEncodeError):
+            continue
+    return data.decode("utf-8", errors="replace")
+
+
 def _strip_html(text: str) -> str:
-    """Remove HTML tags and collapse whitespace."""
+    """Remove HTML tags, style/script blocks, comments, and unescape entities."""
+    import html as _html
+    # Remove <style> and <script> blocks (including their content)
+    text = re.sub(r"<style[^>]*>.*?</style>", "", text, flags=re.DOTALL | re.IGNORECASE)
+    text = re.sub(r"<script[^>]*>.*?</script>", "", text, flags=re.DOTALL | re.IGNORECASE)
+    # Remove HTML comments
+    text = re.sub(r"<!--.*?-->", "", text, flags=re.DOTALL)
+    # Strip remaining tags
     plain = re.sub(r"<[^>]*>", "", text)
+    # Unescape HTML entities
+    plain = _html.unescape(plain)
+    # Collapse whitespace
     plain = re.sub(r"\s+", " ", plain)
     return plain.strip()
 
@@ -73,10 +97,10 @@ def _make_dedup_key(content: ClipboardContent) -> str:
 def _build_preview(types: dict[ContentType, bytes]) -> str:
     """Build a human-readable preview from clipboard content."""
     if ContentType.TEXT in types:
-        text = types[ContentType.TEXT].decode("utf-8", errors="replace")
+        text = _safe_decode(types[ContentType.TEXT])
         return text[:200]
     if ContentType.HTML in types:
-        html = types[ContentType.HTML].decode("utf-8", errors="replace")
+        html = _safe_decode(types[ContentType.HTML])
         plain = _strip_html(html)
         return plain[:200] if plain else "[HTML]"
     if ContentType.IMAGE_EMF in types:

internal/platform/notify.py

@@ -72,8 +72,25 @@ def show(self, title: str, message: str):
         if self._tray_icon:
             try:
                 self._tray_icon.notify(message, title=title)
+            except NotImplementedError:
+                logger.debug("pystray notify not implemented for this backend")
+                self._fallback_notify(title, message)
             except Exception:
                 logger.debug("Desktop notification failed", exc_info=True)
 
+    @staticmethod
+    def _fallback_notify(title: str, message: str):
+        """Fallback desktop notification via system command (Linux)."""
+        import subprocess
+        import sys
+        if sys.platform == "linux":
+            try:
+                subprocess.run(
+                    ["notify-send", title, message],
+                    capture_output=True, timeout=5,
+                )
+            except Exception:
+                pass
+
 
 notification_mgr = NotificationManager()

internal/ui/dashboard.py

@@ -2272,6 +2272,7 @@ def _refresh_web_card(self):
                 import qrcode
                 from PIL import Image
                 img = qrcode.make(url)
+                img = img.convert("RGB")
                 img = img.resize((100, 100), Image.LANCZOS)
                 ctk_img = ctk.CTkImage(light_image=img, dark_image=img, size=(100, 100))
                 self._web_qr_label.configure(image=ctk_img, text="")

internal/ui/settings_window.py

@@ -624,6 +624,7 @@ def _refresh_web_qr(self):
 
             if token:
                 img = _qrcode.make(url)
+                img = img.convert("RGB")
                 img = img.resize((200, 200), Image.LANCZOS)
                 self._web_qr_image = ctk.CTkImage(
                     light_image=img, dark_image=img, size=(200, 200),

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "clipsync"
-version = "1.0.1"
+version = "1.0.3"
 description = "Cross-platform clipboard sharing over LAN"
 readme = "README.md"
 license = { text = "MIT" }