v0.1.0-alpha.4 Implemented batch task operations

BREAKING CHANGE: Moved the badger database directory from
~/.config/nasin-pali to ~/.config/nasin-pali/data. Migrate with:

```
mkdir ~/.config/np-data
mv ~/.config/nasin-pali/* ~/.config/np-data/
mv ~/.config/np-data ~/.config/nasin-pali/data
```

✨ Features
- cmd/t: Enabled batch status updates (e.g., `np t u -i id1 -s st1 -i
  id2 -s st2`). This reduces context window usage by printing the
  updated plan once. Help texts were also enhanced for multi-task
  additions and batch patterns across several commands.

🐛 Bug Fixes
- cmd/t: Without subcommands or arguments, show task list without
  goal/goal desc at the top
- cmd: Removed an errant newline character from plan output
- db!: Moved the Badger database into a dedicated 'data' subdirectory
  (e.g., ~/.config/nasin-pali/data/) for better organization and to
  accommodate future configuration files.

♻️ Code Refactoring
- cmd: Clarified batch operation output. The full plan is now only shown
  when multiple tasks are added; 'Added' is printed for single tasks.
  Help text for batch mode and checking tasks after sequential adds was
  also improved.

📚 Documentation
- Various polish

🔧 Build System
- version: Ensured extended tags are used correctly when appropriate
  for versioning.
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