fix(tui): don't quit on Q when create modal is open

Remove viewCreateModal from the list of states where pressing Q
triggers quit, allowing users to type titles containing "q".

fix: remove column headers from TUI list view

- Remove buildColumnHeader() function and its usage
- Keep headers only in `beans list` CLI output

chore: beans!

chore: scrap the stats command

Cleanup

Update README

refactor: use text/template for prompt command

- Replace strings.Builder with text/template for cleaner output generation
- Move dynamic sections (GraphQL schema, types, statuses, priorities) into template
- Rename prompt.md to prompt.tmpl to reflect its template nature

fix!: return error from beans query on GraphQL errors

- executeQuery now returns an error when GraphQL errors occur
- On success, returns just the data portion instead of full response
- CLI now exits with status code 1 on GraphQL errors
- Updated tests to expect new behavior

fix!: remove interactive TUI from beans create command (#8)

BREAKING CHANGE: The --no-edit flag has been removed and beans create
no longer opens an editor or interactive form by default.

- Remove interactive form (huh) that prompted for title/status/type
- Remove $EDITOR launching after bean creation
- Remove --no-edit flag (non-interactive is now the default)
- Remove unused formatStatusLabel helper function

This fixes issues where agents encounter "Vim: Warning: Output is not
to a terminal" errors. The create command is now purely non-interactive,
making it reliable for agent use.

Closes #8

fix: adjust status colors for better visual hierarchy

- Change backlog from gray to blue for visibility
- Change completed and scrapped to gray to de-emphasize archived items