GTK menu bar: top-level entries poorly spaced (missing space between 'View' and 'Go')

[JDonaghy]

Symptom

The GTK menu-bar top-level entries render as `File Edit ViewGo Run Terminal Help` — "View" and "Go" are concatenated without the per-entry padding visible around the others.

Likely cause

The menu-bar strip is not drawn through `ContextMenu` — that primitive only handles the dropdown popups. The top-level row is its own (probably bespoke) GTK rasteriser. Either:

1. The padding between entries is computed from each entry's pixel width, and "View" + "Go" together happen to be a width where a divisor / modulo lands at zero.
2. The render code uses a fixed gap for each entry except a special-case at "View" / "Go" that erroneously skips padding.
3. A recent change to the menu-bar adapter dropped the trailing whitespace from one of those entries.

Files

• `src/gtk/draw.rs` — search for "File Edit View" or `MENU_STRUCTURE` rendering.
• `src/render.rs` — `menu_bar_to_quadraui` adapter (if it exists).

Surfaced by

#223 ContextMenu pilot smoke test (Session 332). Pre-existing — not affected by the rasteriser pilots.