feat: add app bar input and native facet filtering to todos
Move the new todo input from workspace into the app bar alongside date
navigation controls. The input is enabled for today and future dates,
disabled for historical dates with appropriate placeholder text.
Add native facet selection support - when a specific facet is selected,
only that facet's todos are shown. The input placeholder dynamically
updates to indicate which facet new todos will be added to, and the
server uses the selected facet as the default when no #facet hashtag
is specified.
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Co-Authored-By: Claude <noreply@anthropic.com>