style: match the prettier version the lockfile pins

Format check failed twice, on different files each time, because three prettier
versions were in play: package.json says ^3.4.0, package-lock pins 3.8.3 (CI runs
npm ci, so that is the one CI uses), and the local node_modules had 3.9.6. Files
formatted with 3.9.6 were then "fixed" with 3.4.2, pushing session-routes and
system-routes onto a third style — every version change moved the failure to a
different set of files.

Line-break placement in `await import` and a union type only; no logic changes.

src/web/routes/session-routes.ts

@@ -944,9 +944,8 @@ export function registerSessionRoutes(
       }
     }
     if (body.mode === 'antigravity') {
-      const { isAntigravityAvailable, getAntigravityNotFoundMessage } = await import(
-        '../../utils/antigravity-cli-resolver.js'
-      );
+      const { isAntigravityAvailable, getAntigravityNotFoundMessage } =
+        await import('../../utils/antigravity-cli-resolver.js');
       if (!isAntigravityAvailable()) {
         return createErrorResponse(ApiErrorCode.OPERATION_FAILED, getAntigravityNotFoundMessage());
       }
@@ -3026,9 +3025,8 @@ export function registerSessionRoutes(
       // Check OpenCode availability if requested. Error text comes from the
       // resolver so it carries the resolution diagnostics; same for the modes below.
       if (mode === 'opencode') {
-        const { isOpenCodeAvailable, getOpenCodeNotFoundMessage } = await import(
-          '../../utils/opencode-cli-resolver.js'
-        );
+        const { isOpenCodeAvailable, getOpenCodeNotFoundMessage } =
+          await import('../../utils/opencode-cli-resolver.js');
         if (!isOpenCodeAvailable()) {
           return createErrorResponse(ApiErrorCode.OPERATION_FAILED, getOpenCodeNotFoundMessage());
         }
@@ -3052,9 +3050,8 @@ export function registerSessionRoutes(
 
       // Check Antigravity availability if requested
       if (mode === 'antigravity') {
-        const { isAntigravityAvailable, getAntigravityNotFoundMessage } = await import(
-          '../../utils/antigravity-cli-resolver.js'
-        );
+        const { isAntigravityAvailable, getAntigravityNotFoundMessage } =
+          await import('../../utils/antigravity-cli-resolver.js');
         if (!isAntigravityAvailable()) {
           return createErrorResponse(ApiErrorCode.OPERATION_FAILED, getAntigravityNotFoundMessage());
         }

src/web/routes/system-routes.ts

@@ -683,9 +683,8 @@ export function registerSystemRoutes(
         `Installing ${pkg} into profile "${profile}" failed: ${detail}`
       );
     }
-    const { listDeepSeekProfiles, resolveDefaultDeepSeekProfile, isDeepSeekRunnable } = await import(
-      '../../utils/deepseek-cli-resolver.js'
-    );
+    const { listDeepSeekProfiles, resolveDefaultDeepSeekProfile, isDeepSeekRunnable } =
+      await import('../../utils/deepseek-cli-resolver.js');
     return {
       profile,
       package: pkg,