feat: added hashtag and hashtag screen

[addegbenga]

As part of this issue

1. Implemented automatic hashtag detection in note creation. When users type # followed by text, the system automatically detects it as a hashtag.
2. Enhanced the notes Card UI to display detected hashtags as clickable badges within notes.
3. Added a feature to allow users to click a hashtag badge, which redirects them to a dedicated page showing all notes associated with that tag.
4. Removed $ dollar sign from token balance in Swap.