Widget: Quick Add dismisses instantly instead of blocking on network

Tapping "Add" ran addTask() plus up to five sequential follow-up calls
(description, due date, project, labels, recurrence) and a widget
refresh, all inside the sheet's own lifecycleScope, before finish() --
the sheet sat on screen doing nothing visible for however long that
chain took, reported as "sits black for a couple seconds."

Moved the actual submission into a new AddTaskWorker, following the
same pattern already established by CompleteWorker/DeferWorker: a
CoroutineWorker enqueued fire-and-forget, so it survives the activity
finishing (lifecycleScope wouldn't -- it's cancelled the moment the
activity is destroyed). onAdd now does a local-only DataStore config
check (fast, no network, so a missing server URL/token still doesn't
silently eat what was typed), then confirms via toast and calls
finish() immediately, mirroring the optimistic-dismiss pattern
TaskDetailActivity.onComplete already uses. The worker preserves the
original partial-failure reporting (a toast listing what didn't stick)
for the rare case something after addTask itself fails, now delivered
asynchronously via Toast.makeText posted to the main thread rather than
blocking the sheet on it.

Verification: this exact activity hit the same headless-emulator input
limitation noted earlier this session (2026-08-06, QuickAdd keyboard
focus) -- confirmed it's an environment constraint, not a regression,
by trying both `input text` and raw `input keyevent` injection (which
also failed) against a field that visibly has focus, on the same
emulator where the same commands work fine for an equivalent
OutlinedTextField in SettingsActivity. Verified instead by: go build/
test equivalent (./gradlew testDebugUnitTest, all passing -- the
individual WidgetRepository calls AddTaskWorker orchestrates already
have unit coverage in WidgetRepositoryTest.kt), a clean assembleDebug,
and a crash-sanity launch on emulator-5556 with no FATAL in logcat.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EZ7ikw2ukGJFTHE3bJS7zL

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