feat(ebook): implement phrase matching functionality and UI enhancements

python/ebook_search/api/templates/search.html

@@ -9,10 +9,21 @@
         <label for="query">What are you looking for?</label>
         <textarea id="query" name="query" rows="4" placeholder="Ask a question or paste a passage…" required></textarea>
         <div class="form-row">
-            <label class="check">
-                <input type="checkbox" name="rerank" value="true" {% if config.rerank.enabled %}checked{% endif %}>
-                Rerank
-            </label>
+            <div class="search-toggles">
+                <label class="check">
+                    <input type="checkbox" name="rerank" value="true" {% if config.rerank.enabled %}checked{% endif %}>
+                    Rerank
+                </label>
+                <label class="check">
+                    <input
+                        type="checkbox"
+                        name="phrase_matching"
+                        value="true"
+                        {% if config.phrase_matching_enabled %}checked{% endif %}
+                    >
+                    Phrase matching
+                </label>
+            </div>
             <button type="submit">Search</button>
         </div>
     </form>