Continues the UI-first pass started by the New Game button. Per the
design principle in CLAUDE.md / ARCHITECTURE.md §1, every player action
must be reachable from a visible UI control with the keyboard shortcut
as an optional accelerator. Refactor the single New Game button into a
flex-row "action bar" anchored top-right with four buttons: Undo,
Pause, Help, New Game (left → right; New Game rightmost as the most
consequential action).
Plumbing:
- New `PauseRequestEvent` and `HelpRequestEvent` in events.rs.
- pause_plugin::toggle_pause reads either Esc or PauseRequestEvent so
the button and the keyboard accelerator drive the same code path
(with the existing drag / game-over / selection guards).
- help_plugin::toggle_help_screen reads either F1 or HelpRequestEvent;
also fix the stale module-doc claim that H toggles help (it's F1 —
H is bound to hint cycle in input_plugin).
- hud_plugin now spawns four ActionButton-marked buttons via a
ChildSpawnerCommands helper, with one click handler per button
firing its respective request event. A single
paint_action_buttons system covers hover/pressed colour for all of
them via the shared ActionButton marker. The click handlers
defensively re-register their request events so the plugin works in
isolation under MinimalPlugins (tests). add_message is idempotent.
- ARCHITECTURE.md HudPlugin row updated to call out the action bar.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
funman300
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