feat(plating): comprehensive timezone fix across dashboards/PDFs/emails

Database stores datetimes naive-UTC, but the dashboards and emails were
showing UTC strings to users in EST/EDT — making 9pm Toronto look like 1am
the next day. Adds a single helper module + auto-detection on install.

Core changes (fusion_plating):
- New fp_tz.py helper: fp_user_tz, fp_format, fp_isoformat_utc, fp_time_ago
  Resolves user.tz → company.x_fc_default_tz → UTC.
- res.company.x_fc_default_tz Selection (full pytz IANA list)
- res.config.settings exposes the company tz under a new "Regional
  Settings" block in Settings > Fusion Plating
- post_init_hook auto-populates the tz on first install: tries admin
  user → server /etc/timezone → America/Toronto fallback
- fp_process_node._to_dict now sends create_date/write_date as ISO with
  explicit +00:00 marker so JS new Date() parses it as UTC and the
  recipe tree editor's "time ago" math works correctly

Shop-floor controllers:
- shopfloor_controller.py: every fields.Datetime.to_string() and naive
  .strftime() swapped for fp_format(env, ...) — due_at, bake times,
  last_log_date, gates, server_time all now in user's tz
- _time_ago() removed; replaced with fp_time_ago helper which compares
  tz-aware datetimes (the local one was naive-vs-naive and could be
  off by hours)
- manager_controller.py date_planned: str(...)[:10] slice replaced
  with fp_format MM/DD in user's tz

Notifications + reports:
- mail_template_data.xml: 5 .strftime() calls in body_html → babel
  format_datetime / format_date with tz=(user.tz or company tz)
- report_fp_job_traveller.xml: rec.received_date (Datetime) gets
  t-options="{'widget':'datetime'}" so Odoo's QWeb renders in user tz

Settings view layout:
- fusion_plating now owns the Settings page "Fusion Plating" app shell
- fusion_plating_certificates xpaths into it instead of redefining
  (prevents app-name collision)

Verified on odoo-entech (LXC 111): post_init_hook detects
America/Toronto from /etc/timezone, MO date_start 2026-04-17 05:28 UTC
correctly displays as 2026-04-17 01:28 EDT.

Module versions bumped: fusion_plating 19.0.3.0.0,
fusion_plating_shopfloor 19.0.9.0.0, plus certificates / notifications /
reports → 19.0.3.0.0.

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

fusion_plating/fusion_plating/models/fp_process_node.py

@@ -6,6 +6,8 @@
 from odoo import api, fields, models, _
 from odoo.exceptions import ValidationError
 
+from .fp_tz import fp_isoformat_utc
+
 
 class FpProcessNode(models.Model):
     """A node in the process recipe tree.
@@ -312,9 +314,11 @@ class FpProcessNode(models.Model):
             'child_count': len(children),
             'opt_in_out': self.opt_in_out or 'disabled',
             'input_count': len(self.input_ids),
-            'create_date': self.create_date.isoformat() if self.create_date else '',
+            # ISO with explicit UTC marker so JS new Date() parses it
+            # correctly and re-localises to the browser's timezone.
+            'create_date': fp_isoformat_utc(self.create_date),
             'create_uid_name': self.create_uid.name if self.create_uid else '',
-            'write_date': self.write_date.isoformat() if self.write_date else '',
+            'write_date': fp_isoformat_utc(self.write_date),
             'write_uid_name': self.write_uid.name if self.write_uid else '',
             'children': children,
         }