fix(widget): match task font color to events; complete instantly

TaskRow used a flat hardcoded gray (0xFFDDDDDD) while EventBlock used
Color.White (dimmed only when past) at the same size/weight -- the
color mismatch read as a font difference. Both now use the same
Color.White base.

CompleteTaskAction previously did no local update at all: the row
stayed visible until CompleteWorker's full complete() ->
fetchAndPersist() -> updateAll() round trip finished (two sequential
network calls). It now optimistically removes the completed item from
the cached list and re-renders immediately, matching RefreshTaskAction's
existing synchronous-flag-then-updateAll pattern -- the background
worker's own fetchAndPersist still replaces this with the authoritative
server state (including a newly-created recurring successor, if any)
moments later.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VTUSAEKfsPc6WGDq45yPHD

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