[ZaneThurston]

Requested by Zane

Track App, AP3 step 2 (docs/OMSI_APP_REFACTOR.md, tracked in #61). Move-only.

What changes

• The twenty fields of the old drawing's Ui that say where the menu's parts and the information bar were drawn move to hud/domain/hits.rs as Hits. These are menu_rects, menu_ctl, menu_side, menu_pane*, menu_time, menu_start/menu_rows/menu_row_h, the scroll bars, dd_* and info_rect.
• Ui holds them as ui.hits, and Hits::default() keeps the old starting values (dd_rows 8, menu_row_h 1).
• Shifting the rectangles for one panel of a spanning window becomes Hits::shift. Ui::shift_hitboxes calls it and still moves the chat box.
• PageFrame::write_hits (the new menu pages) now takes &mut Hits instead of &mut hud::Ui, so the new interface no longer needs the old drawing to report its rectangles. This is what AP3 needs before the new_ui*.rs files move to ui/.
• Callers read ui.hits.<field>: the mouse, the keyboard, touch, the actions, the frame in app_events.rs, and the tests.

The overlay indices (menu_overlay_range, vr_cursor_overlay, vr_tooltip_overlay) stay in Ui, because they belong to the drawing.

The commit message calls the method NewMenuPage::write_hits. The type is PageFrame.

Checks

• cargo test -p omsi-app --lib --test app, with all features (845 passed, 17 ignored) and without features (805 passed, 16 ignored).
• The list of test names is the same as on main.
• The lib warnings without features are the same as on main.
• No access to these fields is left outside hits., including the Windows-only files, which were checked by search because they don't compile on Linux.
• cargo fmt was run on the touched files only.

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