'/' focuses the search bar from anywhere (Layout-level listener).
j/k move focus up/down the email list in FolderView and SearchResults;
e archives the focused email, # trashes it. All shortcuts are ignored
while an input/textarea/select has focus, so typing is never hijacked.
A small hint footer in the bottom-right reminds users of the shortcuts.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
cesnimda
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