fix: page de base - titre au-dessus du tableau, tableau au ras du sidebar (v7.49.2)

- .db-first (page_editor_scripts._applyLayout) quand le premier bloc est une
  base embarquee : .blocks-container/.page-title-block passent a margin:0 +
  padding-left:var(--space-lg) au lieu de max-width:900px centre -> le tableau
  demarre a x=256 (marge topbar) au lieu de x=694 sur 1920px (mesure Playwright).
- .block-embed-collection { max-width:100%; overflow:hidden } : l'embed ne
  deborde plus de sa colonne (les popovers fixes restent hors du clipping).
- page_editor_collection.html : h1.database-page-title au-dessus du conteneur
  (les pages collection dediees n'avaient pas de titre).
- Bump VERSION/main.py 7.49.2, CHANGELOG, WORKLOAD, OpenAPI regenere.
- Instance locale flowdeck-final rebuildee flowdeck:v7.49.2 :8081, health OK.

app/main.py

@@ -185,7 +185,7 @@ async def lifespan(_app: FastAPI):
 
 app = FastAPI(
     title="FlowDeck",
-    version="7.49.1",
+    version="7.49.2",
     docs_url="/docs",
     redoc_url="/redoc",
     lifespan=lifespan,

app/templates/page_editor_collection.html

@@ -5,6 +5,7 @@ page_title %}{{ page.title }}{% endblock %} {% block topbar %}
 {% set right_actions %}<span class="topbar-edited" style="cursor:pointer;" @click="edCall('toggleActivityOpen')">Edited <span x-text="edTimeAgo()"></span> ▾</span><button class="topbar-btn share-btn" @click="edCall('toggleShareOpen')"><span x-show="!edShared()">{{ fd_icon("lock",14) }} Share ▾</span><span x-show="edShared()" title="This page is shared">👥 Shared ▾</span></button><button class="topbar-btn" @click="edCall('copyPageLink')" title="Copy link">{{ fd_icon("link",14) }}</button><button class="topbar-btn star-btn" @click="edCall('toggleFavorite')" x-init="bindStar($el)"></button><button class="topbar-btn relative" @click="edCall('toggleMoreOpen')">⋯</button>{% endset %}
 {% include '_header.html' %}
 {% endblock %} {% block content %}
+<h1 class="database-page-title">{{ page.title }}</h1>
 {% include "_database_table.html" %}
 {% endblock %} {% block scripts %}
 <script data-cfasync="false" nonce="{{ csp_nonce() }}">