fix: web search not working in :web filter mode

Added evaluate_raw() method to WebSearchProvider and handler in
search_with_frecency() to support raw queries when using :web prefix.

Same pattern as calculator fix - trigger prefixes (?, web) call
evaluate() while filter mode (:web) calls evaluate_raw().

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/providers/mod.rs

@@ -264,6 +264,12 @@ impl ProviderManager {
                 results.push((web_result, 9000));
             }
         }
+        // Also check for raw query when in :web filter mode
+        else if filter.active_prefix() == Some(ProviderType::WebSearch) && !query.is_empty() {
+            if let Some(web_result) = self.websearch.evaluate_raw(query) {
+                results.push((web_result, 9000));
+            }
+        }
 
         // Empty query (after checking special providers) - return frecency-sorted items
         if query.is_empty() {

src/providers/websearch.rs

@@ -113,14 +113,24 @@ impl WebSearchProvider {
             return None;
         }
 
-        let url = self.build_search_url(search_term);
+        self.evaluate_raw(search_term)
+    }
+
+    /// Evaluate a raw search term (for :web filter mode)
+    pub fn evaluate_raw(&self, search_term: &str) -> Option<LaunchItem> {
+        let trimmed = search_term.trim();
+        if trimmed.is_empty() {
+            return None;
+        }
+
+        let url = self.build_search_url(trimmed);
 
         // Use xdg-open to open the browser
         let command = format!("xdg-open '{}'", url);
 
         Some(LaunchItem {
-            id: format!("websearch:{}", search_term),
-            name: format!("Search: {}", search_term),
+            id: format!("websearch:{}", trimmed),
+            name: format!("Search: {}", trimmed),
             description: Some("Open in browser".to_string()),
             icon: Some("web-browser".to_string()),
             provider: ProviderType::WebSearch,