Add welcome wizard, desktop entry, and Nautilus extension

data/live.lashman.Pixstrip.desktop

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+[Desktop Entry]
+Name=Pixstrip
+Comment=Batch image processor - resize, convert, compress, and more
+Exec=pixstrip-gtk %F
+Icon=live.lashman.Pixstrip
+Terminal=false
+Type=Application
+Categories=Graphics;ImageProcessing;
+MimeType=image/jpeg;image/png;image/webp;image/avif;image/gif;image/tiff;image/bmp;
+Keywords=image;photo;resize;convert;compress;batch;metadata;strip;watermark;rename;
+StartupNotify=true

data/nautilus-pixstrip.py

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+"""Nautilus extension for Pixstrip - adds 'Process with Pixstrip' submenu to image context menu."""
+
+import os
+import subprocess
+import json
+
+from gi.repository import Nautilus, GObject
+
+SUPPORTED_MIMETYPES = [
+    "image/jpeg",
+    "image/png",
+    "image/webp",
+    "image/avif",
+    "image/gif",
+    "image/tiff",
+    "image/bmp",
+]
+
+
+def get_presets():
+    """Load built-in and user presets."""
+    presets = [
+        "Blog Photos",
+        "Social Media",
+        "Web Optimization",
+        "Email Friendly",
+        "Privacy Clean",
+        "Photographer Export",
+        "Archive Compress",
+        "Fediverse Ready",
+    ]
+
+    # Load user presets
+    config_dir = os.path.expanduser("~/.config/pixstrip/presets")
+    if os.path.isdir(config_dir):
+        for filename in sorted(os.listdir(config_dir)):
+            if filename.endswith(".json"):
+                filepath = os.path.join(config_dir, filename)
+                try:
+                    with open(filepath) as f:
+                        data = json.load(f)
+                        name = data.get("name", "")
+                        if name and name not in presets:
+                            presets.append(name)
+                except (json.JSONDecodeError, IOError):
+                    pass
+
+    return presets
+
+
+class PixstripMenuProvider(GObject.GObject, Nautilus.MenuProvider):
+    def get_file_items(self, files):
+        # Only show for image files
+        if not files:
+            return []
+
+        for f in files:
+            if f.get_mime_type() not in SUPPORTED_MIMETYPES:
+                return []
+
+        items = []
+
+        # Main menu item
+        top_item = Nautilus.MenuItem(
+            name="PixstripMenuProvider::process",
+            label="Process with Pixstrip",
+            tip="Open images in Pixstrip for batch processing",
+        )
+
+        submenu = Nautilus.Menu()
+        top_item.set_submenu(submenu)
+
+        # Open in Pixstrip
+        open_item = Nautilus.MenuItem(
+            name="PixstripMenuProvider::open",
+            label="Open in Pixstrip...",
+            tip="Open the Pixstrip wizard with these images",
+        )
+        open_item.connect("activate", self._on_open, files)
+        submenu.append_item(open_item)
+
+        # Separator via disabled item
+        sep = Nautilus.MenuItem(
+            name="PixstripMenuProvider::sep1",
+            label="---",
+            sensitive=False,
+        )
+        submenu.append_item(sep)
+
+        # Preset items
+        for preset in get_presets():
+            safe_name = preset.replace(" ", "_").lower()
+            item = Nautilus.MenuItem(
+                name=f"PixstripMenuProvider::preset_{safe_name}",
+                label=preset,
+                tip=f"Process with {preset} preset",
+            )
+            item.connect("activate", self._on_preset, files, preset)
+            submenu.append_item(item)
+
+        items.append(top_item)
+        return items
+
+    def _on_open(self, menu, files):
+        paths = [f.get_location().get_path() for f in files]
+        subprocess.Popen(["pixstrip-gtk"] + paths)
+
+    def _on_preset(self, menu, files, preset):
+        paths = [f.get_location().get_path() for f in files]
+        subprocess.Popen(
+            ["pixstrip-cli", "process"] + paths + ["--preset", preset]
+        )