[Task] SQL in Browser

We can use sql.js to evaluate SQL in browser and on the server. This should help with providing both client and server evaluation of a task.

The task needs a few settings:

• instruction: string
• defaultQuery: string

For evaluation, it should check whether the resulting datasets are equal. We can use EXCEPT to check that.

• db: URL to a sqlite3 database
• query: Solution query to compare against

For feedback, there should be a few checks:

• Report mismatched row count: If EXCEPT returns rows
• Report mismatched column count: If EXCEPT errors with "SELECTs to the left and right of EXCEPT do not have the same number of result columns"
• Report mismatched/unordered columns: If EXCEPT returns all rows
• Show query result as table

For the UI, we only need a code input with highlighting for the SQL query.

Start by locating the task configuration, SQL evaluation entry points, and the existing UI pattern for code input and result display. The work is done when browser and server evaluation use the listed settings, compare datasets with EXCEPT, report the specified mismatches, show results as a table, and provide SQL highlighting.