v0.4.1 — Help F1 and visible focus on a text console

Help F1 and visible focus on a text console

Two fixes to 0.4.0's console mode, both found by Javier testing it himself in bitlaForge and alacrittyForge on a real text console (a KognogOS VM), and both re-tested by him before this release.

• F-12 (#4) — the menu says where Help is. A text console sends Ctrl+H as Backspace, so Help there is on F1 (since 0.4.0), but nothing on screen said so and the underlined H promised Ctrl+H. On a console the menu bar now reads … Help F1 Quit. In a terminal window nothing changes.
• F-13 (#5) — Tab visibly moves the focus. Textual marks the focused button with a tint and bold, which a console cannot show, while the primary button is coloured all the time, so focus seemed to stay behind. On a console every button now follows one rule: normal grey, primary cyan, error red, focused blue with white text, a colour no other state uses.

Tested: 26 tests (3 new), 0 warnings; the window look is unchanged (README screenshots regenerate identical); both fixes checked on the VM's real console by Claude and then by Javier: "all tested and good!"

Also found in the same test and filed elsewhere: jetomev/bitlaforge#3 (Esc does not leave a Config field), jetomev/KognogOS#8 (the shell greeting on a text console).

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