Onboarding · Help: help panel, cheatsheet, what's new, feedback, support, inline help

HelpPanel searches articles and opens one, its body in Markdown, with a
way back; focus follows to All articles and back to the search, a
link to help:<key> opens another, and Contact support and Keyboard
shortcuts wait at its foot. KeyboardShortcutCheatsheet puts
settings::KeyboardShortcutsList in a dialog with its search focused;
WhatsNewDialog puts data_display::Changelog in one with Got it.
FeedbackWidget asks how it is going with four faces and a note, and
thanks. ContactSupport sends a topic and a message, spins while the
owner sends, and empties the message with focus back in it. InlineHelp
is a quiet line with Learn more. HelpTooltip moves to primitives,
where FormLabel's help mark shows it; ToggleGroup keys its toggles by
its own id. EmptyStateWithAction points to feedback::EmptyState.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tasks/ch31-43.md

@@ -208,14 +208,14 @@
 
 ## T37b Onboarding · Help
 
-- [ ] HelpTooltip
-- [ ] HelpPanel / DocsSidebar
-- [ ] KeyboardShortcutCheatsheet
-- [ ] WhatsNewDialog
-- [ ] FeedbackWidget
-- [ ] ContactSupport
-- [ ] InlineHelp
-- [ ] EmptyStateWithAction → `feedback::EmptyState`
+- [x] HelpTooltip → `primitives::HelpTooltip`, the mark FormLabel's help shows
+- [x] HelpPanel / DocsSidebar
+- [x] KeyboardShortcutCheatsheet — `settings::KeyboardShortcutsList` in an `overlays::Dialog`
+- [x] WhatsNewDialog — `data_display::Changelog` in an `overlays::Dialog`
+- [x] FeedbackWidget
+- [x] ContactSupport
+- [x] InlineHelp
+- [x] EmptyStateWithAction → `feedback::EmptyState`, whose `action` adds its buttons
 
 ## T38 Interaction — `src/interaction`