Fix error handling consistency in auto-import and fallback paths (#47)

* Fix error handling consistency in auto-import and fallback paths

- Add error checking/warnings for auto-import CRUD operations (UpdateIssue, CreateIssue, AddDependency)
- Add error checking/warnings for auto-import label operations (AddLabel, RemoveLabel)
- Add warning when import hash storage fails (prevents unnecessary re-imports)
- Add proper error handling for UserHomeDir with fallback to current directory

These changes make auto-import error handling consistent with manual operations
and prevent silent failures that could confuse users or cause data inconsistencies.

* Remove invalid version property from golangci-lint config

* Fix linter errors: errcheck, unused, goconst, and misspell

- Fix unchecked error returns in ROLLBACK statements
- Fix unchecked type assertion for status field
- Extract LIMIT SQL constant to reduce duplication
- Fix spelling: cancelled -> canceled
- Remove unused ensureCounterInitialized function
- Remove unused parameter in parallel test goroutine

internal/storage/sqlite/events.go

@@ -9,6 +9,8 @@ import (
 	"github.com/steveyegge/beads/internal/types"
 )
 
+const limitClause = " LIMIT ?"
+
 // AddComment adds a comment to an issue
 func (s *SQLiteStorage) AddComment(ctx context.Context, issueID, actor, comment string) error {
 	tx, err := s.db.BeginTx(ctx, nil)
@@ -52,7 +54,7 @@ func (s *SQLiteStorage) GetEvents(ctx context.Context, issueID string, limit int
 	args := []interface{}{issueID}
 	limitSQL := ""
 	if limit > 0 {
-		limitSQL = " LIMIT ?"
+		limitSQL = limitClause
 		args = append(args, limit)
 	}