fix: sync ID counters after import to prevent collisions

When importing issues with explicit high IDs (e.g., bd-100), the
issue_counters table wasn't being updated. This caused the next
auto-generated issue to collide with existing IDs (bd-4 instead of bd-101).

Changes:
- Add SyncAllCounters() to scan all issues and update counters atomically
- Add SyncCounterForPrefix() for granular counter synchronization
- Call SyncAllCounters() in import command after creating issues
- Add comprehensive tests for counter sync functionality
- Update TestImportCounterSyncAfterHighID to verify fix

The fix uses a single efficient SQL query to prevent ID collisions
with subsequently auto-generated issues.

internal/storage/sqlite/sqlite_test.go

@@ -479,3 +479,68 @@ func TestMultiProcessIDGeneration(t *testing.T) {
 		t.Errorf("Expected no errors, got %d", len(errors))
 	}
 }
+
+func TestSyncCounterForPrefix(t *testing.T) {
+	store, cleanup := setupTestDB(t)
+	defer cleanup()
+
+	ctx := context.Background()
+
+	// Set config for issue prefix
+	if err := store.SetConfig(ctx, "issue_prefix", "bd"); err != nil {
+		t.Fatalf("Failed to set issue prefix: %v", err)
+	}
+
+	// Create a few auto-generated issues (bd-1, bd-2, bd-3)
+	for i := 0; i < 3; i++ {
+		issue := &types.Issue{
+			Title:     "Auto issue",
+			Status:    types.StatusOpen,
+			Priority:  1,
+			IssueType: types.TypeTask,
+		}
+		if err := store.CreateIssue(ctx, issue, "test"); err != nil {
+			t.Fatalf("Failed to create issue: %v", err)
+		}
+	}
+
+	// Sync counter to 100
+	if err := store.SyncCounterForPrefix(ctx, "bd", 100); err != nil {
+		t.Fatalf("SyncCounterForPrefix failed: %v", err)
+	}
+
+	// Next auto-generated issue should be bd-101
+	issue := &types.Issue{
+		Title:     "After sync",
+		Status:    types.StatusOpen,
+		Priority:  1,
+		IssueType: types.TypeTask,
+	}
+	if err := store.CreateIssue(ctx, issue, "test"); err != nil {
+		t.Fatalf("Failed to create issue after sync: %v", err)
+	}
+
+	if issue.ID != "bd-101" {
+		t.Errorf("Expected ID bd-101 after sync, got %s", issue.ID)
+	}
+
+	// Syncing to a lower value should not decrease the counter
+	if err := store.SyncCounterForPrefix(ctx, "bd", 50); err != nil {
+		t.Fatalf("SyncCounterForPrefix failed: %v", err)
+	}
+
+	// Next issue should still be bd-102, not bd-51
+	issue2 := &types.Issue{
+		Title:     "After lower sync",
+		Status:    types.StatusOpen,
+		Priority:  1,
+		IssueType: types.TypeTask,
+	}
+	if err := store.CreateIssue(ctx, issue2, "test"); err != nil {
+		t.Fatalf("Failed to create issue: %v", err)
+	}
+
+	if issue2.ID != "bd-102" {
+		t.Errorf("Expected ID bd-102 (counter should not decrease), got %s", issue2.ID)
+	}
+}