Fix widget showing tomorrow's dated tasks under today

Root cause: doot-native and Google Tasks due dates are always
midnight-anchored (even when a task genuinely has a due date), which trips
TimelineItem.ComputeDaySection's "midnight means no specific time" heuristic
and sets IsAllDay=true on them. TimelineItemToWidgetItem then left wi.Start
nil for any Task/GTask with IsAllDay=true, and the Android client's
undated/floating pool (DootWidget.kt's `floating` list) has zero per-day
awareness -- it just packs items forward from "now" -- so a task due
tomorrow rendered as if due today. This was previously diagnosed and
deliberately set aside (see project_doot_isallday_midnight_bug memory) with
a simpler proposed fix (gate ComputeDaySection's heuristic to Event/Meal
types); re-verifying that plan against the actual code before implementing
it surfaced a real problem with it: it would also flip IsAllDay to false for
same-day dated tasks, moving them from the web's untimed-item strip into the
hourly grid with a fabricated "12:00 AM" time label -- fixing the widget by
breaking the web's currently-correct rendering.

Actual fix: added TimelineItem.Undated, a signal genuinely independent of
IsAllDay -- true only for the caller's two genuinely-dateless constructions
(nativeUndated tasks, gtasks with no due date), both of which already use
Time=now as a layout placeholder rather than a real date. ComputeDaySection
and IsAllDay are untouched, so web rendering is unaffected. This gate.go
change routes on that new signal instead: dated Task/GTask items now get
wi.Start populated (so the Android client's existing, already-correct
Start-based day bucketing runs for them) while genuinely undated ones keep
today's nil-Start floating treatment exactly as before.

Also fixed the same latent bug in wi.DueDate's guard while in the same
code path: it only checked !Time.IsZero(), but nativeUndated's Time=now
placeholder is non-zero, so an undated task's Android detail popup would
have shown a fabricated due date of whatever moment the request happened
to run. Now guards on !Undated too.

Verified: added TestTimelineItemToWidgetItem_DatedGTaskGetsStart and
TestTimelineItemToWidgetItem_UndatedTaskWithPlaceholderTime_NilDueDate,
and updated the three existing tests that had encoded the bug's old
"Start stays nil for any IsAllDay task" assumption as expected behavior
(TestTimelineItemToWidgetItem_Task, _DootTaskGetsDueDate,
_AllDayTask_KeepsFloatingBehavior -- the last one needed Undated: true
added since it no longer implies undated on its own). Proved the fix by
reverting internal/handlers/widget.go to the pre-fix condition against a
real backup and confirming exactly the three tests exercising the new
behavior fail, then restored from that backup and confirmed byte-identical.
go build/vet/test all clean.

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

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