Hide SQLite virtual table internals

[DhruvShah-Dev]

Summary

• Filters SQLite table_xinfo rows with hidden = 1 out of column metadata.
• Keeps generated columns visible by continuing to expose hidden = 2 and hidden = 3 as generated metadata.
• Adds FTS5 coverage for direct and batch SQLite column metadata lookups.

Root Cause

PRAGMA table_xinfo includes hidden virtual-table columns that table_info did not return. Those rows were mapped as normal writable columns and surfaced in the New Row modal.

Fixes #622

Validation

• git diff --check
• cargo test test_get_columns_excludes_hidden_virtual_table_columns --lib -- --nocapture timed out locally after 3 minutes during Rust execution/build.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• src-tauri/src/drivers/sqlite/mod.rs
• src-tauri/src/drivers/sqlite/tests.rs

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_{Reviewed by glm-5.2 · Input: 102.8K · Output: 7.8K · Cached: 96.4K}