Add similar app recommendations from shared categories

src/core/database.rs

@@ -1869,6 +1869,51 @@ impl Database {
         )
     }
 
+    // --- Similar apps ---
+
+    /// Find AppImages from the user's library that share categories with the given app.
+    pub fn find_similar_apps(
+        &self,
+        categories: &str,
+        exclude_id: i64,
+        limit: i32,
+    ) -> SqlResult<Vec<(i64, String, Option<String>)>> {
+        // Split categories and match any overlap
+        let cats: Vec<&str> = categories.split(';').filter(|s| !s.is_empty()).collect();
+        if cats.is_empty() {
+            return Ok(Vec::new());
+        }
+
+        // Build LIKE conditions for each category
+        let conditions: Vec<String> = cats.iter()
+            .map(|c| format!("categories LIKE '%{}%'", c.replace('\'', "''")))
+            .collect();
+        let where_clause = conditions.join(" OR ");
+
+        let sql = format!(
+            "SELECT id, COALESCE(app_name, filename) AS name, icon_path
+             FROM appimages
+             WHERE id != ?1 AND ({})
+             LIMIT ?2",
+            where_clause
+        );
+
+        let mut stmt = self.conn.prepare(&sql)?;
+        let rows = stmt.query_map(params![exclude_id, limit], |row| {
+            Ok((
+                row.get::<_, i64>(0)?,
+                row.get::<_, String>(1)?,
+                row.get::<_, Option<String>>(2)?,
+            ))
+        })?;
+
+        let mut results = Vec::new();
+        for row in rows {
+            results.push(row?);
+        }
+        Ok(results)
+    }
+
     // --- System modification tracking ---
 
     pub fn register_modification(

src/ui/detail_view.rs

@@ -868,6 +868,38 @@ fn build_overview_tab(record: &AppImageRecord, db: &Rc<Database>) -> gtk::Box {
     }
     inner.append(&info_group);
 
+    // "You might also like" - similar apps from the user's library
+    if let Some(ref cats) = record.categories {
+        if let Ok(similar) = db.find_similar_apps(cats, record.id, 4) {
+            if !similar.is_empty() {
+                let similar_group = adw::PreferencesGroup::builder()
+                    .title("You might also like")
+                    .build();
+
+                for (id, name, icon_path) in &similar {
+                    let row = adw::ActionRow::builder()
+                        .title(name.as_str())
+                        .activatable(true)
+                        .build();
+
+                    let icon = widgets::app_icon(
+                        icon_path.as_deref(),
+                        name,
+                        32,
+                    );
+                    row.add_prefix(&icon);
+
+                    // Store the record ID in the widget name for navigation
+                    row.set_widget_name(&format!("similar-{}", id));
+
+                    similar_group.add(&row);
+                }
+
+                inner.append(&similar_group);
+            }
+        }
+    }
+
     clamp.set_child(Some(&inner));
     tab.append(&clamp);
     tab