[mbulloni]

Implements the one-shot import proposed in #1206 (also covers the database part of #1318): Data › Get & Transform Data › From Database runs one SQL query and puts the result in a new sheet as a table. It implements the data.fromDatabase id the keytip table already reserves for APND.

What it does

• data.fromDatabase {driver, connection, query, user?, password?, sheet?, maxRows?, timeout?}, with driver one of postgres, mysql (also MariaDB), sqlite, odbc. With no parameters it opens a form (driver, connection, query, optional credentials).
• The result lands in a new sheet as a table, with typed cells (numbers, booleans, dates/times as Excel serials, text). Integers beyond 2^53 come in as text so no digits are lost. maxRows truncates and the result says so.
• The password is never written to the command journal, and passwords in connection URLs are masked in the log.
• SQLite opens read-only. Every driver has a connect/query timeout (default 30 s), and a runaway SQLite query is interrupted.

How it's built

• New native-only crate gridcraft-datasource with the drivers: postgres, mysql (rustls), rusqlite (bundled). ODBC through the system driver manager sits behind an odbc feature, off by default, so a plain build needs no system library. The desktop app and CLI forward the feature.
• The engine stays network-free and wasm-clean. The host (desktop app, CLI) injects a DataSource into the session, and without one the command returns an error. cargo xtask wasm passes.
• Catalog entry added (275 / 291); gaps.md §12, file-format-parity.md, target-app-parity.md and ROADMAP.md updated.

Overlap with #1203

#1203 brings the full Get & Transform Data / Power Query surface, including ODBC (and SQL Server/Access through ODBC) in crates/external, and wires the same APND keytip. This PR is much smaller and adds what #1203 doesn't have: native PostgreSQL, MySQL/MariaDB and SQLite drivers that need no ODBC driver installed. I'm happy to adapt to whichever lands first, for example dropping the ODBC driver here and keeping only the native ones as extra sources, or moving them into #1203's source model.

Testing

• cargo xtask ci: fmt, clippy, assets, layers, wasm, parity and keytips pass. In test everything passes except command_sequence_fuzz: adding a command reshuffles seed 0, which then hits the contested-spill bug Calc: a contested spill area changes hands on Calculate Now and on reopening #964 / fix(calc): Calculate Now swaps which overlapping spill wins (Excel keeps the first, GridCraft moves #SPILL! to it) #1190. The shrunk sequence uses no database command and fails on main too. With Calc: a contested spill area stays with its array on full recalc and reopening (#964) #984 applied, all 8 steps pass.
• Unit tests for the command (dialog on empty params, journal without password, truncation, errors without a host or with a bad driver) and for each driver's value mapping. The SQLite driver is tested end to end, including read-only and the interrupted runaway query. PostgreSQL, MySQL and ODBC are covered by unit tests only, not against a live server in CI.
• Manual: Linux release build with --features odbc, SQLite import through gridcraft-cli run.

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