refactor: migrate from better-sqlite3 to bun:sqlite

- Updated build-hooks.js to remove better-sqlite3 dependency and use bun:sqlite.
- Modified smart-install.js to eliminate checks and installations related to better-sqlite3.
- Refactored Database.ts, SessionSearch.ts, SessionStore.ts, and migrations.ts to import and utilize bun:sqlite.
- Replaced exec and pragma calls with appropriate run methods for bun:sqlite compatibility.
- Removed unnecessary native module verification and installation logic for better-sqlite3.

plugin/scripts/smart-install.js

@@ -287,17 +287,6 @@ async function runNpmInstall() {
         encoding: 'utf-8',
       });
 
-      // Verify better-sqlite3 was installed
-      if (!existsSync(BETTER_SQLITE3_PATH)) {
-        throw new Error('better-sqlite3 installation verification failed');
-      }
-
-      // Verify native modules actually work
-      const nativeModulesWork = await verifyNativeModules();
-      if (!nativeModulesWork) {
-        throw new Error('Native modules failed to load after install');
-      }
-
       const packageVersion = getPackageVersion();
       const nodeVersion = getNodeVersion();
       setInstalledVersion(packageVersion, nodeVersion);