fix(editor): SQL keywords are not highlighted (SELECT / FROM render in the plain foreground colour) #1814

Problem

In the SQL workspace of a SQLite connection (the Demo Playground, default dark theme), SELECT * FROM orders; renders SELECT and FROM in the plain foreground colour. The * is coloured as an operator, so highlighting runs, but keywords get no colour.

Checked in a running debug build (dev at 7cae35c):

• the active theme's editor.keyword is #569CD6 (blue), editor.foreground is near white;
• sampling the pixels of the editor line finds only near-white text, nothing in the keyword colour;
• same at 100 % and 150 % interface scale.

The text was put into the editor through its controller (the MCP toolkit's enter_text), not typed key by key. Worth checking both, since text set programmatically (history, opening a .sql file, a pasted query) takes the same path.

Where to look

QueryaHighlightController / SyntaxHighlightService and the SQL grammar: whether keyword tokens get a scope that maps to editor.keyword, and whether a programmatic text = re-runs highlighting.

Acceptance

• SELECT, FROM, WHERE, JOIN … use editor.keyword in the built-in themes, typed or set programmatically.
• A widget test pins the keyword colour of a highlighted line.