fix: Lumiere card dropdown clipped by card's backdrop-filter and transform

.lumiere-card has both backdrop-filter and a hover transform, both of
which create a new containing block for position:fixed descendants,
trapping Popper dropdowns inside the card's overflow:hidden bounds.

Fix: move .lumiere-card-actions outside .lumiere-card (sibling inside
.lumiere-card-wrapper, which has position:relative but no filter or
transform). The actions strip is now absolutely positioned at the card
bottom with its own solid background and bottom border-radius.
No backdrop-filter on the strip to avoid re-introducing the same trap.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

services/web/frontend/js/features/project-list/components/project-list-lumiere.tsx

@@ -171,17 +171,19 @@ const ProjectCard = memo(function ProjectCard({
             <span className="lumiere-card-date">{date}</span>
           </div>
         </a>
-        <div className="lumiere-card-actions">
-          <CopyProjectButtonTooltip project={project} />
-          <DownloadProjectButtonTooltip project={project} />
-          {project.compiler === 'quarto' ? (
-            <DownloadPresentationButtonTooltip project={project} />
-          ) : (
-            <CompileAndDownloadProjectPDFButtonTooltip project={project} />
-          )}
-          <ArchiveProjectButtonTooltip project={project} />
-          <TrashProjectButtonTooltip project={project} />
-        </div>
+      </div>
+      {/* Actions live outside .lumiere-card so Popper dropdowns are not
+          clipped by the card's backdrop-filter / transform context. */}
+      <div className="lumiere-card-actions">
+        <CopyProjectButtonTooltip project={project} />
+        <DownloadProjectButtonTooltip project={project} />
+        {project.compiler === 'quarto' ? (
+          <DownloadPresentationButtonTooltip project={project} />
+        ) : (
+          <CompileAndDownloadProjectPDFButtonTooltip project={project} />
+        )}
+        <ArchiveProjectButtonTooltip project={project} />
+        <TrashProjectButtonTooltip project={project} />
       </div>
     </div>
   )

services/web/frontend/stylesheets/pages/project-list-lumiere.scss

@@ -537,14 +537,28 @@ $lum-noise: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' wi
     }
   }
 
-  // Action strip — icon buttons that fade in when the card is hovered
+  // Action strip — lives *outside* .lumiere-card so the dropdown menus inside
+  // are not trapped by the card's backdrop-filter and transform (both of which
+  // create a new containing block for position:fixed, clipping Popper menus).
+  // position:absolute on the wrapper (which has no transform/filter) lets any
+  // position:fixed child escape to the viewport as expected.
   .lumiere-card-actions {
+    position: absolute;
+    bottom: 0;
+    left: 0;
+    right: 0;
+    z-index: 2;
     display: flex;
     align-items: center;
     justify-content: center;
     gap: 2px;
     padding: 3px 6px 5px;
+    // Solid background — intentionally no backdrop-filter here, which would
+    // also create a fixed containing block and trap the Popper dropdown.
+    background: rgba(255, 255, 255, 0.97);
     border-top: 1px solid rgba($lum-teal, 0.10);
+    border-bottom-left-radius: 10px;
+    border-bottom-right-radius: 10px;
     opacity: 0;
     transition: opacity 0.15s ease;
 
@@ -561,8 +575,8 @@ $lum-noise: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' wi
     }
   }
 
-  .lumiere-card:hover .lumiere-card-actions,
-  .lumiere-card:focus-within .lumiere-card-actions {
+  .lumiere-card-wrapper:hover .lumiere-card-actions,
+  .lumiere-card-wrapper:focus-within .lumiere-card-actions {
     opacity: 1;
   }