Improve UX, add popover tour, metadata, and hicolor icons

- Redesign tutorial tour from modal dialogs to popovers pointing at actual UI elements
- Add beginner-friendly improvements: help buttons, tooltips, welcome wizard enhancements
- Add AppStream metainfo with screenshots, branding, categories, keywords, provides
- Update desktop file with GTK category and SingleMainWindow
- Add hicolor icon theme with all sizes (16-512px)
- Fix debounce SourceId panic in rename step
- Various step UI improvements and bug fixes

data/live.lashman.Pixstrip.desktop

@@ -5,7 +5,8 @@ Exec=pixstrip-gtk %F
 Icon=live.lashman.Pixstrip
 Terminal=false
 Type=Application
-Categories=Graphics;ImageProcessing;
+Categories=Graphics;ImageProcessing;GTK;
 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
+SingleMainWindow=true

data/live.lashman.Pixstrip.metainfo.xml

@@ -3,16 +3,18 @@
   <id>live.lashman.Pixstrip</id>
   <metadata_license>CC0-1.0</metadata_license>
   <project_license>CC0-1.0</project_license>
+
   <name>Pixstrip</name>
   <summary>Batch image processor - resize, convert, compress, and more</summary>
 
   <description>
     <p>
-      Pixstrip is a batch image processor for Linux that combines resize, convert,
-      compress, metadata strip, watermark, rename, and basic image adjustments into
-      a single wizard-driven workflow.
+      Pixstrip is a native GTK4/libadwaita batch image processor for Linux
+      that combines resize, convert, compress, metadata strip, watermark,
+      rename, and image adjustments into a single wizard-driven workflow.
+      It processes everything locally with no cloud dependency.
     </p>
-    <p>Features include:</p>
+    <p>Key features:</p>
     <ul>
       <li>Resize images by width, height, fit-in-box, or social media presets</li>
       <li>Convert between JPEG, PNG, WebP, AVIF, GIF, and TIFF</li>
@@ -21,42 +23,137 @@
       <li>Add text or image watermarks with positioning and rotation</li>
       <li>Rename files with templates, counters, regex, and EXIF variables</li>
       <li>Adjust brightness, contrast, saturation, and apply effects</li>
-      <li>Built-in presets for common workflows</li>
+      <li>Built-in presets for common workflows with one-click processing</li>
+      <li>Custom workflow builder with step-by-step wizard</li>
       <li>Watch folders for automatic processing</li>
-      <li>Full CLI with feature parity</li>
+      <li>Processing history with undo via system trash</li>
+      <li>Full CLI with feature parity for scripting and automation</li>
+      <li>File manager integration for Nautilus, Nemo, Thunar, and Dolphin</li>
     </ul>
   </description>
 
-  <launchable type="desktop-id">live.lashman.Pixstrip.desktop</launchable>
+  <icon type="stock">live.lashman.Pixstrip</icon>
 
-  <url type="homepage">https://git.lashman.live/lashman/pixstrip</url>
-  <url type="bugtracker">https://git.lashman.live/lashman/pixstrip/issues</url>
+  <launchable type="desktop-id">live.lashman.Pixstrip.desktop</launchable>
 
   <developer id="live.lashman">
     <name>lashman</name>
   </developer>
 
+  <url type="homepage">https://git.lashman.live/lashman/pixstrip</url>
+  <url type="bugtracker">https://git.lashman.live/lashman/pixstrip/issues</url>
+  <url type="vcs-browser">https://git.lashman.live/lashman/pixstrip</url>
+  <url type="donation">https://ko-fi.com/lashman</url>
+  <url type="contact">https://git.lashman.live/lashman/pixstrip/issues</url>
+  <url type="contribute">https://git.lashman.live/lashman/pixstrip</url>
+
+  <update_contact>lashman@robotbrush.com</update_contact>
+
+  <screenshots>
+    <screenshot type="default">
+      <caption>Workflow selection with built-in presets for common image tasks</caption>
+      <image type="source" width="902" height="1330">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/01.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Image selection with drag-and-drop and batch file management</caption>
+      <image type="source" width="902" height="1330">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/02.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Resize step with width, height, fit-in-box, and social media presets</caption>
+      <image type="source" width="902" height="1330">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/03.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Format conversion between JPEG, PNG, WebP, AVIF, GIF, and TIFF</caption>
+      <image type="source" width="902" height="1330">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/04.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Compression with live before/after preview and file size estimates</caption>
+      <image type="source" width="902" height="1330">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/05.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Metadata stripping with selective EXIF field management</caption>
+      <image type="source" width="902" height="1330">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/06.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Watermark placement with text and image options</caption>
+      <image type="source" width="902" height="1330">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/07.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Batch rename with templates, counters, and EXIF variables</caption>
+      <image type="source" width="902" height="1330">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/08.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Image adjustments for brightness, contrast, and saturation</caption>
+      <image type="source" width="902" height="1330">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/09.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Settings with output preferences and file manager integration</caption>
+      <image type="source" width="902" height="1330">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/10.png</image>
+    </screenshot>
+  </screenshots>
+
   <branding>
-    <color type="primary" scheme_preference="light">#99c1f1</color>
-    <color type="primary" scheme_preference="dark">#1a5fb4</color>
+    <color type="primary" scheme_preference="light">#57a773</color>
+    <color type="primary" scheme_preference="dark">#263226</color>
   </branding>
 
+  <categories>
+    <category>Graphics</category>
+    <category>ImageProcessing</category>
+    <category>GTK</category>
+  </categories>
+
+  <keywords>
+    <keyword>Image</keyword>
+    <keyword>Photo</keyword>
+    <keyword>Resize</keyword>
+    <keyword>Convert</keyword>
+    <keyword>Compress</keyword>
+    <keyword>Batch</keyword>
+    <keyword>Metadata</keyword>
+    <keyword>Watermark</keyword>
+    <keyword>Rename</keyword>
+    <keyword>EXIF</keyword>
+    <keyword>WebP</keyword>
+    <keyword>AVIF</keyword>
+  </keywords>
+
   <content_rating type="oars-1.1" />
 
   <requires>
     <display_length compare="ge">360</display_length>
   </requires>
 
+  <recommends>
+    <control>keyboard</control>
+    <control>pointing</control>
+  </recommends>
+
   <supports>
     <control>pointing</control>
     <control>keyboard</control>
     <control>touch</control>
   </supports>
 
+  <provides>
+    <binary>pixstrip-gtk</binary>
+    <binary>pixstrip</binary>
+  </provides>
+
   <releases>
-    <release version="0.1.0" date="2026-03-06">
+    <release version="0.1.0" date="2026-03-06" type="stable">
       <description>
-        <p>Initial release with full wizard workflow, 8 built-in presets, CLI parity, watch folders, and file manager integration.</p>
+        <p>Initial release of Pixstrip with core features:</p>
+        <ul>
+          <li>Wizard-driven batch processing with 8 built-in presets</li>
+          <li>Resize, convert, compress, metadata strip, watermark, rename, and adjust</li>
+          <li>Optimized encoders: mozjpeg, oxipng, libwebp, and ravif</li>
+          <li>Live compression preview with before/after comparison</li>
+          <li>Watch folders for automatic processing</li>
+          <li>Processing history with undo via system trash</li>
+          <li>Full CLI with feature parity</li>
+          <li>File manager integration for Nautilus, Nemo, Thunar, and Dolphin</li>
+        </ul>
       </description>
     </release>
   </releases>