fix(search): SMILES auto-detection and citations search button

app/Actions/Coconut/SearchMolecule.php

@@ -120,9 +120,9 @@ private function determineQueryType($query)
             return 'parttialinchikey';
         }
 
-        // Check for molecular formula (must match pattern and not contain SMILES-specific characters)
-        // Molecular formulas contain only element symbols and numbers (e.g., C6H12O6, H2O)
-        if (preg_match('/^([A-Z][a-z]?\d*)+$/', $query) && ! preg_match('/[()@\[\]\/\\\\=#\-+]/', $query)) {
+        // Molecular formulas use condensed notation (e.g., C6H12O6, H2O), not SMILES chains
+        // like C1CCCCC1 or CCO where the same element appears in consecutive tokens.
+        if ($this->looksLikeMolecularFormula($query)) {
             return 'molecularformula';
         }
 
@@ -139,6 +139,32 @@ private function determineQueryType($query)
         return 'text';
     }
 
+    /**
+     * True when the query looks like a Hill-order molecular formula, not a SMILES string.
+     */
+    private function looksLikeMolecularFormula(string $query): bool
+    {
+        if (! preg_match('/^([A-Z][a-z]?\d*)+$/', $query) || preg_match('/[()@\[\]\/\\\\=#\-+]/', $query)) {
+            return false;
+        }
+
+        preg_match_all('/[A-Z][a-z]?\d*/', $query, $matches);
+
+        $previousElement = null;
+        foreach ($matches[0] as $token) {
+            preg_match('/^([A-Z][a-z]?)/', $token, $elementMatch);
+            $element = $elementMatch[1];
+
+            if ($element === $previousElement) {
+                return false;
+            }
+
+            $previousElement = $element;
+        }
+
+        return true;
+    }
+
     /**
      * Apply status filter to SQL query.
      * Only adds a filter when status is 'approved' or 'revoked'.

resources/views/livewire/welcome.blade.php

@@ -206,7 +206,7 @@ class="h-full w-full border-transparent py-2 pl-8 pr-3 text-sm text-gray-900 pla
                                             </div>
                                             <div class="flex items-center md:ml-1">
                                                 <button type="submit"
-                                                    @click="window.location.href = '/search?q=' + encodeURIComponent(query) + '&tagType=citation&type=tags&activeTab=citation'"
+                                                    @click="window.location.href = '/search?q=' + encodeURIComponent(query) + '&tagType=citations&type=tags&activeTab=citations'"
                                                     class="rounded-md bg-secondary-dark px-3.5 py-1.5 text-base font-semibold leading-7 text-white shadow-sm hover:bg-secondary-light focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-indigo-600 mr-3"><svg
                                                         xmlns="http://www.w3.org/2000/svg" fill="none"
                                                         viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor"

tests/Unit/SearchMoleculeQueryTypeTest.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace Tests\Unit;
+
+use App\Actions\Coconut\SearchMolecule;
+use PHPUnit\Framework\TestCase;
+use ReflectionMethod;
+
+class SearchMoleculeQueryTypeTest extends TestCase
+{
+    /**
+     * @dataProvider queryTypeProvider
+     */
+    public function test_determine_query_type(string $query, string $expectedType): void
+    {
+        $search = new SearchMolecule;
+        $method = new ReflectionMethod(SearchMolecule::class, 'determineQueryType');
+        $method->setAccessible(true);
+
+        $this->assertSame($expectedType, $method->invoke($search, $query));
+    }
+
+    public static function queryTypeProvider(): array
+    {
+        return [
+            'cyclohexane smiles' => ['C1CCCCC1', 'smiles'],
+            'benzene smiles' => ['c1ccccc1', 'smiles'],
+            'molecular formula' => ['C6H12', 'molecularformula'],
+            'glucose formula' => ['C6H12O6', 'molecularformula'],
+            'water formula' => ['H2O', 'molecularformula'],
+            'cnp identifier' => ['CNP0228556', 'identifier'],
+            'compound name' => ['caffeine', 'text'],
+        ];
+    }
+}