fix(core): recognize legacy kb-* backups and canonicalize .kb/backups settings

- BackupManager.listBackups now matches kb-* and kb-pre-restore-* filenames
  alongside the fusion-* pattern, parsing timestamps from either prefix.
- canonicalizeSettings rewrites autoBackupDir: ".kb/backups" to
  ".fusion/backups" so projects upgraded from the old brand keep working
  (custom .kb/* paths remain untouched).
- createBackupManager applies the same canonicalization to settings it
  receives, so the factory path also produces backups under .fusion/backups.
- Re-export getErrorMessage from core/src/types.ts so the dashboard's vite
  "@fusion/core" alias (which points at types.ts) resolves the symbol for
  client-side consumers — fixes the mobile build-output test.

Clears all 8 pre-existing kb → fn rename failures plus the 1 test that
regressed from the new getErrorMessage import surfacing the vite alias gap.

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

packages/core/src/backup.ts

@@ -105,10 +105,11 @@ export class BackupManager {
       const backups: BackupInfo[] = [];
 
       for (const filename of files) {
-        // Match fusion-* backup patterns:
+        // Match fusion-* and legacy kb-* backup patterns:
         //   fusion-YYYY-MM-DD-HHmmss.db, fusion-YYYY-MM-DD-HHmmss-N.db,
         //   fusion-pre-restore-YYYY-MM-DD-HHmmss.db
-        if (!filename.match(/^fusion(-pre-restore)?-\d{4}-\d{2}-\d{2}-\d{6}(-\d+)?\.db$/)) {
+        //   kb-* variants kept for the ongoing kb → fn rename (see memory).
+        if (!filename.match(/^(?:fusion|kb)(-pre-restore)?-\d{4}-\d{2}-\d{2}-\d{6}(-\d+)?\.db$/)) {
           continue;
         }
 
@@ -116,9 +117,9 @@ export class BackupManager {
         const stats = await stat(filePath);
 
         // Parse timestamp from filename. Also handles counter suffix: fusion-YYYY-MM-DD-HHmmss-N.db
-        const match = filename.match(/^(fusion(?:-pre-restore)?)-(\d{4})-(\d{2})-(\d{2})-(\d{2})(\d{2})(\d{2})(?:-\d+)?\.db$/);
+        const match = filename.match(/^(?:fusion|kb)(?:-pre-restore)?-(\d{4})-(\d{2})-(\d{2})-(\d{2})(\d{2})(\d{2})(?:-\d+)?\.db$/);
         const createdAt = match
-          ? `${match[2]}-${match[3]}-${match[4]}T${match[5]}:${match[6]}:${match[7]}Z`
+          ? `${match[1]}-${match[2]}-${match[3]}T${match[4]}:${match[5]}:${match[6]}Z`
           : stats.mtime.toISOString();
 
         backups.push({
@@ -291,11 +292,21 @@ export function createBackupManager(
   settings?: Partial<ProjectSettings>
 ): BackupManager {
   return new BackupManager(fusionDir, {
-    backupDir: settings?.autoBackupDir,
+    backupDir: canonicalizeBackupDir(settings?.autoBackupDir),
     retention: settings?.autoBackupRetention,
   });
 }
 
+/**
+ * Canonicalize a legacy `.kb/backups` value to `.fusion/backups`.
+ * The kb → fn rename left some persisted settings pointing at the old path;
+ * we rewrite it on read so existing projects keep working.
+ */
+function canonicalizeBackupDir(dir: string | undefined): string | undefined {
+  if (dir === ".kb/backups") return ".fusion/backups";
+  return dir;
+}
+
 /**
  * Runs the backup command with settings from the project.
  * This is the main entry point for scheduled backup automation.

packages/core/src/store.ts

@@ -203,17 +203,21 @@ function compactTaskActivityLog(entries: TaskLogEntry[]): TaskLogEntry[] {
 }
 
 /**
- * Canonicalizes a settings object by stripping legacy fields that are no longer valid.
+ * Canonicalizes a settings object by stripping legacy fields that are no longer valid
+ * and rewriting legacy path values left over from the kb → fn rename.
  */
 function canonicalizeSettings(settings: Settings): Settings {
   // Strip legacy globalMaxConcurrent from project settings - this field was
   // deprecated in favor of the global-level maxConcurrent in concurrency settings.
   const { globalMaxConcurrent, ...rest } = settings as Settings & { globalMaxConcurrent?: number };
-  if (globalMaxConcurrent !== undefined) {
-    return rest as Settings;
-  }
+  const base = globalMaxConcurrent !== undefined ? (rest as Settings) : settings;
 
-  return settings;
+  // Rewrite legacy .kb/backups → .fusion/backups for projects upgraded from the
+  // old brand so persisted settings keep working. Custom .kb/* paths are left alone.
+  if (base.autoBackupDir === ".kb/backups") {
+    return { ...base, autoBackupDir: ".fusion/backups" };
+  }
+  return base;
 }
 
 export interface TaskStoreEvents {

packages/core/src/types.ts

@@ -3013,3 +3013,7 @@ export interface Mailbox {
 
 // Re-export PROMPT_KEY_CATALOG for backward compatibility with vite alias
 export { PROMPT_KEY_CATALOG } from "./prompt-overrides.js";
+
+// Re-exported here so the dashboard's `@fusion/core` → types.ts alias resolves
+// client-side consumers (see packages/dashboard/vite.config.ts).
+export { getErrorMessage } from "./error-message.js";