Two changes to _fp_get_stage_timeline:
1. Format: 'May 16, 2026 \xb7 9:14 AM' (full year + space + uppercase
AM/PM) instead of 'may 16 \xb7 9:14a'. Matches the mockup the
user approved. Date-only render kicks in when the timestamp has
no time component (backfilled/interpolated midnight values), so
we don't show fake '12:00 AM' next to a date we only know to the
day.
2. Linear interpolation: records that pre-date Task 16's per-stage
Datetime hook had empty middle-stage timestamps. The new fallback
spreads done stages evenly between received_at (or received_date)
and now() so old records show a plausible progression instead of
gap-toothed empty rows. Records created post-hook hit the real
captured values and never reach the interpolation branch.
Helper imports datetime + time at module level since we need
datetime.combine for Date->Datetime conversion in the fallback chain.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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