fix(jobs): theme tokens + dark-mode support across remaining OWL SCSS files

The 4 client-action SCSS files I shipped in Phase 6 ignored the
project's documented design system (CLAUDE.md "Card Styling" + "Dark
Mode" rules) and used hardcoded hex / var(--bs-*) for surfaces.
Result: dark mode rendered white-text-on-white-card.

Companion to "changes" (22573e7) which already landed
_fp_jobs_tokens.scss + the job_plant_overview.scss refactor.
This commit finishes the job:

- Refactored job_process_tree.scss, job_manager_dashboard.scss and
  job_tablet.scss to reference the $fp-* tokens — zero hardcoded
  hex on theme-sensitive surfaces. Three-layer contrast applied per
  CLAUDE.md (page → container → card).
- Process tree keeps the intentional Steelhead-style dark-slate
  card fill in BOTH bundles (deliberate visual choice, not a theme
  bug); page / header / connectors / empty state are now token-
  driven so they look right against light or dark page surfaces.
- Manifest assets list reordered so _fp_jobs_tokens.scss compiles
  first in web.assets_backend (CLAUDE.md rule: SCSS variables in
  earlier files are visible to later files in the same bundle).
  This is what makes the compile-time
  $o-webclient-color-scheme branch in the partial actually take
  effect for the four consumer files.

Verified on entech: light bundle (web.assets_backend) and dark
bundle (web.assets_web_dark) both compile without SCSS errors and
emit distinct surface hexes (light: #f3f4f6 page / #ffffff card;
dark: #1a1d21 page / #22262d card).

Manifest 19.0.3.0.0 → 19.0.3.1.0.

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': '19.0.3.0.0',
+    'version': '19.0.3.1.0',
     'category': 'Manufacturing/Plating',
     'summary': 'Native plating job model — replaces mrp.production / mrp.workorder bridge.',
     'author': 'Nexa Systems Inc.',
@@ -57,6 +57,12 @@ full design rationale and §6.2 of the implementation plan for task list.
     ],
     'assets': {
         'web.assets_backend': [
+            # Tokens MUST be first — Odoo concatenates bundle files in
+            # order, and SCSS variables defined in earlier files are
+            # visible to later files in the same bundle. The token
+            # partial branches on $o-webclient-color-scheme so the dark
+            # bundle (web.assets_web_dark) gets a distinct palette.
+            'fusion_plating_jobs/static/src/scss/_fp_jobs_tokens.scss',
             'fusion_plating_jobs/static/src/scss/job_process_tree.scss',
             'fusion_plating_jobs/static/src/scss/job_plant_overview.scss',
             'fusion_plating_jobs/static/src/scss/job_manager_dashboard.scss',