Sweep: Define interface for sql.js prepared statements

[zknpr]

This PR addresses a code health issue by replacing the unsafe any return type for prepare() in src/core/sqlite-db.ts with a proper WasmPreparedStatement interface.

Changes:

• Defined WasmPreparedStatement interface with methods run, get, step, reset, free, and getColumnNames.
• Updated WasmDatabaseInstance to use WasmPreparedStatement.
• Updated WasmDatabaseEngine implementation to handle the typed statement object, including proper handling of get() return values (which can be undefined).
• Added tests/unit/api_coverage.test.ts to verify the behavior of fetchTableData and updateCellBatch which rely on the prepared statement API.

Verification:

• npm run compile passes.
• npm test passes, including existing tests and the new API coverage tests.
• Confirmed that get() behavior aligns with sql.js (returns row array or undefined).

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PR created automatically by Jules for task 1782077784216029526 started by @zknpr

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Project	Deployment	Actions	Updated (UTC)
sq-lite-explorer	Ready	Preview, Comment	Feb 7, 2026 2:22pm

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[zknpr]

Merged as part of v1.3.0 release in PR #65

[google-labs-jules]

Merged as part of v1.3.0 release in PR #65

Acknowledged. Thank you for the update regarding the v1.3.0 release.