Adds a new --all-issues flag that displays all issues in the database:
- bd show --all-issues shows every issue
- Warns when showing more than 20 issues (performance)
- Works only in direct mode (--no-daemon required for now)
- Provides clear error message in daemon mode
- Help text warns that this may be expensive for large databases
This is useful for getting a complete overview of the database,
but users should be aware it can be slow with many issues.
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