feat: smart systray Léa (plyer), preflight GPU, fix tests, support qwen3-vl

- Smart systray (pystray+plyer) remplace PyQt5 : notifications toast,
  menu dynamique avec workflows, chat "Que dois-je faire ?", icône colorée
- Preflight GPU : check_machine_ready() + @pytest.mark.gpu dans conftest
- Correction 63 tests cassés → 0 failed (1200 passed)
- Tests VWB obsolètes déplacés vers _a_trier/
- Support qwen3-vl:8b sur GPU (remplace qwen2.5vl:3b)
  - fix images < 32x32 (Ollama panic)
  - fix force_json=False (qwen3-vl incompatible)
  - fix temperature 0.1 (0.0 bloque avec images)
- Fix captor Windows : Key.esc, _get_key_name()
- Fix LeaServerClient : check_connection, list_workflows format
- deploy_windows.py : packaging propre client Windows
- VWB : edges visibles (#607d8b) + fitView automatique

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/test_coaching_e2e.py

@@ -104,6 +104,7 @@ class TestCoachingE2E:
             )
             session1.add_decision(record)
 
+        coaching_persistence.save_session(session1)
         coaching_persistence.complete_session(session1.session_id, success=True)
 
         # Verify session stats
@@ -145,6 +146,7 @@ class TestCoachingE2E:
             )
             session2.add_decision(record)
 
+        coaching_persistence.save_session(session2)
         coaching_persistence.complete_session(session2.session_id, success=True)
         print(f"Session 2 completed: {session2.stats}")
 
@@ -166,6 +168,7 @@ class TestCoachingE2E:
                 )
                 session.add_decision(record)
 
+            coaching_persistence.save_session(session)
             coaching_persistence.complete_session(session.session_id, success=True)
             print(f"Session {sess_num} completed: all accepted")
 
@@ -331,6 +334,7 @@ class TestCoachingE2E:
                 workflow_id=workflow_id
             )
 
+        coaching_persistence.save_session(session)
         coaching_persistence.complete_session(session.session_id, success=True)
 
         # Verify corrections captured in pack
@@ -367,6 +371,7 @@ class TestCoachingE2E:
             )
             session.add_decision(record)
 
+        coaching_persistence.save_session(session)
         coaching_persistence.complete_session(session.session_id, success=True)
 
         metrics = metrics_collector.get_workflow_metrics(workflow_id)
@@ -389,6 +394,7 @@ class TestCoachingE2E:
                 )
                 session.add_decision(record)
 
+            coaching_persistence.save_session(session)
             coaching_persistence.complete_session(session.session_id, success=True)
 
         metrics = metrics_collector.get_workflow_metrics(workflow_id)
@@ -426,6 +432,7 @@ class TestCoachingE2E:
                     )
                     session.add_decision(record)
 
+                coaching_persistence.save_session(session)
                 coaching_persistence.complete_session(session.session_id, success=True)
 
         # Get global metrics