fix(jobs): auto-resync step.duration_actual on timelog edits

When a supervisor edits a timelog's date_started/date_finished (or
deletes a stale timelog), the parent step's "Actual Min" column
was showing stale data — duration_actual is a regular Float set
once by button_finish.

Adds:
- fp.job.step._fp_resum_duration_actual: quiet helper that re-sums
  duration_actual from time_log_ids.duration_minutes. Skip no-op
  updates so write traffic is minimised.
- fp.job.step.timelog.create/write/unlink hooks: call the helper
  on the affected parent step(s) so duration_actual stays
  consistent. Write hook only fires when date_started/date_finished/
  step_id changed (notes edits skip resync). step_id reassignment
  resyncs both old and new parent.
- Existing action_recompute_duration_from_timelogs (manual button)
  still posts a chatter entry for audit-trail use cases.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating_jobs/__manifest__.py

@@ -3,7 +3,7 @@
 # License OPL-1 (Odoo Proprietary License v1.0)
 {
     'name': 'Fusion Plating — Native Jobs',
-    'version': '19.0.8.20.1',
+    'version': '19.0.8.20.2',
     'category': 'Manufacturing/Plating',
     'summary': 'Native plating job model — replaces mrp.production / mrp.workorder bridge.',
     'author': 'Nexa Systems Inc.',