Word part creation, deletion, and edit confirmations

[denniwang]

This pull request includes several changes to improve the word segmentation feature and enhance the edit functionality in the word panel. The most important changes include adding new SQL queries, updating the form context, and enhancing the UI components to support adding and deleting word segments.

Database Changes:

• Added a new SQL query to delete word segments by word_id in types/queries/delete_word_segments.sql.
• Updated the database_sql.rs file to use the new delete query when segments are empty or before upserting new segments.

Form Context Updates:

• Modified the FormProvider in website/src/edit-word-form-context.tsx to include originalSegmentCount and added validation checks for segment deletion. [1] [2] [3]

UI Enhancements:

• Updated the EditButton in website/src/edit-word-feature.tsx to store the original segment count when entering edit mode. [1] [2]
• Added a new button to the PanelLayout component to allow adding new word parts. [1] [2]
• Enhanced the WordPanel component to support editing and deleting segments, and to always show the word parts panel in edit mode. [1] [2] [3] [4]

Screenshots of frondend changes:
New button to create word parts when there are none in the beginning.

New edit word part form with add and delete functionality

Confirmation message when attempting to save changes that result in a deleted word part

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