feat(sidebar): add New Query to Favorites plus menu

[J2TeamNNL]

Summary

• Add New Query as the first item in the Favorites sidebar + menu; it opens an empty SQL query tab via the existing newTab() path (same as Cmd+T).
• Update docs (favorites.mdx, tabs.mdx) and CHANGELOG.
• Add localization strings for the new menu label and tooltip.

Autocomplete (table/column suggestions), execute shortcuts (Cmd+Enter), and optional auto-uppercase keywords are unchanged; this PR only adds a clearer entry point for creating a new query from the Favorites sidebar.

Test plan

• Connect to a database, switch to the Favorites sidebar tab.
• Click + > New Query and confirm an empty query tab opens with editor focus.
• Confirm New Favorite, New Folder, and linked-folder actions still work.
• Confirm Cmd+T still opens a new query tab.
• Confirm Cmd+Enter still executes a query.
• Confirm Settings > Editor still shows Auto-uppercase keywords (default off).

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[datlechin]

Addressed the review findings and pushed to this branch (maintainerCanModify):

Rebased onto current main / CHANGELOG conflict resolved. The branch was based before 0.56.1/0.56.2. Merged main and put the New Query entry back under [Unreleased], above the released [0.56.2] section. PR is mergeable again; the effective diff is unchanged (5 files: CHANGELOG, string catalog, FavoritesTabView, favorites.mdx, tabs.mdx).

tabs.mdx SQL-button row removal is correct. I checked: there is no toolbar button that opens a new query tab (the only "SQL" references are queryLanguageName: "SQL" plugin metadata). That doc row was stale, so dropping it is a fix, not a regression.

Minor points from the review, resolved: FavoritesTabView lints clean under swiftlint --strict; the old "Add" help string is not orphaned (still used in CustomSlashCommandsSection and FavoriteEditDialog).

On test coverage: no automated test added, and here's why. The action is a single button wired to commandActions.newTab(), which is the same path as Cmd+T and is already exercised. The only end-to-end surface is the Favorites sidebar + menu, which is only reachable with an active connection window, and TableProUITests currently has just launch smoke tests with no connection-seeding harness. A UI test would mean building that harness (seed a SQLite connection at launch), which is out of scope for this change and would be flaky. If a connection-seeding UI harness lands later, this flow is a good candidate to cover then.

One design note for the maintainer, not blocking: putting New Query in the + (add to favorites) menu is slightly off the "add an item to this list" idiom, since it opens a tab rather than adding to the sidebar. The divider and updated tooltip mitigate it, and it's a reasonable convenience, but worth a conscious call.