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

.golangci.yml

@@ -1,8 +1,6 @@
 # golangci-lint configuration for beads
 # See https://golangci-lint.run/usage/configuration/
 
-version: 2
-
 run:
   timeout: 5m
   tests: true