feat: Add option to apply categorization as tags only, notebooks only, or both

[Harsh16gupta]

This PR Allows users to choose how categorization results are applied to notes:

• Both (Notebooks & Tags) (default)
• Tags only - applies cluster and keyword tags without modifying notebooks or folders
• Notebooks only - creates notebooks and moves notes without creating or adding tags

Changes

• Added an Apply Method dropdown in the dashboard UI and Joplin settings.
• Wired the selected method to the apply command.
• Verified that undo cleanly reverts each mode (tags-only undo does not touch folders).
• Added unit tests for each apply mode and undo behavior.
• Bumped version to 0.1.10.

[Harsh16gupta]

This feature was requested by the users on the forum so I have added it.
and the change is simple and well scoped, so merging it.