_resolve_time_with_day_offset() was calling dt_util.now() internally
instead of using the injected now parameter. This caused incorrect date
calculations in tests and any caller that passes a specific reference time.
Also add missing price_rank_* sensor keys to TIME_SENSITIVE_ENTITY_KEYS
in coordinator/constants.py so quarter-hour refresh is registered for all
11 price rank sensors (current/next/previous interval and hour variants).
Rename dt as dt_utils → dt as dt_util (ICN001) across 11 files to follow
the project-wide import alias convention. Apply ruff auto-fixes for import
ordering and collapsing single-item imports throughout the codebase.
Released-Bug: no
Adds migrations.py with automatic entity registry migration for renamed
sensor keys. Separated from coordinator/repairs.py (runtime issues) and
__init__.py _migrate_config_options() (config format changes).
- ENTITY_KEY_RENAMES dict maps old→new entity keys (extensible)
- _auto_migrate_entity_keys() updates unique_id, preserves entity_id
- Handles partial migration (new entity already exists → remove old)
- Creates persistent HA repair issue after migration via ir.async_create_issue()
- Called in async_setup_entry() after _migrate_config_options()
Migrates: trend_change_in_minutes → next_price_trend_change_in
Repair issue informs users about:
- Auto-migrated entity renames (entity_id preserved, no action needed)
- Duration sensor value unit change (hours → minutes): update automation
thresholds from `state < 0.25` to `state < 15` for 15-minute checks
All 5 language files (en, de, nb, nl, sv) updated with translations.
BREAKING CHANGE: Duration sensors (remaining time, starts in, period
duration, trend change countdown) now report state values in minutes
instead of hours. Display unit in dashboards remains hours by default.
Update numeric comparisons in automations accordingly.
Impact: Users upgrading from previous releases see an informational
repair notice guiding them through any required automation updates.
Entity renames are handled transparently with no loss of history.
