perf: éléments remontés au maximum — topbar 40px + paddings réduits

- --topbar-height: 44px → 40px (gain 4px)
- .ws-split: padding-top 8px → 0, min-height via var(--topbar-height)
- .breadcrumb-row: padding 3px→2px, gap 6px→4px, nav-arrow 24px→22px,
  border-radius 10px→8px
- .toolbar-row: padding 3px→2px, gap 6px→4px, margin-bottom 4px→2px,
  border-radius 10px→8px
- Gain total vertical: ~14px (8+4+2). Tout est plus compact.

app/main.py

@@ -39,7 +39,7 @@ async def lifespan(_app: FastAPI):
 
 app = FastAPI(
     title="FlowDeck",
-    version="2.4.0",
+    version="2.4.1",
     docs_url="/docs" if settings.log_level == "DEBUG" else None,
     redoc_url=None,
     lifespan=lifespan,

app/templates/local_workspace.html

@@ -218,15 +218,15 @@
 .ws-table-compact tr:hover td{background:var(--bg-hover);}
 
 /* Split layout */
-.ws-split{display:flex;max-width:100%;margin:0 auto;padding:8px 16px 0;gap:0;min-height:calc(100vh - 44px);}
+.ws-split{display:flex;max-width:100%;margin:0 auto;padding:0 16px 0;gap:0;min-height:calc(100vh - var(--topbar-height));}
 .ws-main{flex:1;min-width:0;overflow:auto;padding-right:0;}
 .preview-panel + .ws-main{margin-right:0;}
 @media(max-width:768px){.ws-split{flex-direction:column;padding:20px 12px 0;}.preview-panel{width:100%;max-width:100%;min-width:100%;}.ws-main{width:100%;}}
 
 /* Breadcrumb row */
-.breadcrumb-row{display:flex;align-items:center;gap:6px;padding:3px 8px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:10px 10px 0 0;margin-bottom:0;flex-wrap:wrap;}
-.breadcrumb-row .nav-arrow{width:24px;height:24px;padding:0;font-size:14px;}
-.toolbar-row{display:flex;align-items:center;gap:6px;padding:3px 8px;background:var(--bg-secondary);border:1px solid var(--border);border-top:none;border-radius:0 0 10px 10px;margin-bottom:4px;flex-wrap:wrap;}
+.breadcrumb-row{display:flex;align-items:center;gap:4px;padding:2px 8px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:8px 8px 0 0;margin-bottom:0;flex-wrap:wrap;}
+.breadcrumb-row .nav-arrow{width:22px;height:22px;padding:0;font-size:13px;}
+.toolbar-row{display:flex;align-items:center;gap:4px;padding:2px 8px;background:var(--bg-secondary);border:1px solid var(--border);border-top:none;border-radius:0 0 8px 8px;margin-bottom:2px;flex-wrap:wrap;}
 .nav-arrow{width:28px;height:28px;font-size:13px;flex-shrink:0;}
 .unified-breadcrumb{flex:1;display:flex;align-items:center;gap:2px;min-width:0;font-size:13px;overflow:hidden;}
 .unified-breadcrumb .bc-icon{font-size:15px;flex-shrink:0;}

static/css/app.css

@@ -45,7 +45,7 @@
   /* ===== Dimensions ===== */
   --sidebar-width: 240px;
   --sidebar-collapsed: 0px;
-  --topbar-height: 44px;
+  --topbar-height: 40px;
   --radius-sm: 4px;
   --radius-md: 6px;
   --radius-lg: 8px;