fix(sqlite): align getSizeOfCollection FTS prefix with createFulltextIndex

testSizeFullText asserts the collection size grows after a fulltext
index is created. The size LIKE pattern was hardcoded to
"{namespace}_{collection}_" while the FTS5 tables now use
getFulltextTablePrefix, which under sharedTables embeds the tenant
segment. With the two paths diverging, the FTS5 shadow tables
(`_data`, `_idx`, `_docsize`, `_config`) didn't match the dbstat LIKE
and the size came out unchanged. Reuse getFulltextTablePrefix so the
naming stays in lockstep regardless of shared-tables mode.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: abnegate

src/Database/Adapter/SQLite.php

@@ -452,7 +452,11 @@ public function getSizeOfCollection(string $collection): int
         $namespace = $this->getNamespace();
         $name = $namespace . '_' . $collection;
         $permissions = $namespace . '_' . $collection . '_perms';
-        $ftsPrefix = "{$namespace}_{$collection}_";
+        // Reuse getFulltextTablePrefix so the LIKE prefix tracks the same
+        // tenant-aware naming createFulltextIndex uses. Hardcoding
+        // "{namespace}_{collection}_" diverged under sharedTables once the
+        // FTS5 tables started carrying a tenant segment.
+        $ftsPrefix = $this->getFulltextTablePrefix($collection);
 
         // FTS5 virtual tables don't show up in dbstat themselves — their
         // storage is backed by shadow tables named `<vtable>_data`,