Add scroll fade indicators to artifact lists and plan steps

- Add fade gradient to artifacts list that hides when scrolled to bottom
- Update plan area fades to use scroll position instead of always showing
- Add hover effect to artifact cards with glowing ellipse indicator
- Fix indentation in UserMessage attachment styles

Components/AssistantMessage.svelte

@@ -29,6 +29,24 @@
     }
     return tally;
   }
+
+  let isScrolledToBottom = true;
+
+  function updateScrollFade(element: HTMLElement) {
+    const { scrollTop, scrollHeight, clientHeight } = element;
+    isScrolledToBottom = scrollHeight - scrollTop - clientHeight < 1;
+  }
+
+  function artifactsListScrollAction(element: HTMLElement) {
+    updateScrollFade(element);
+    const handleScroll = () => updateScrollFade(element);
+    element.addEventListener("scroll", handleScroll);
+    return {
+      destroy() {
+        element.removeEventListener("scroll", handleScroll);
+      }
+    };
+  }
 </script>
 
 <div class="message-container assistant">
@@ -50,18 +68,24 @@
             {/if}
           {/each}
         </div>
-        <div class="artifacts-list-container">
-          {#each message.artifacts as artifact}
-            <div class="artifact-card" aria-label="{artifact.filePath}">
-              <span class="artifact-ellipse artifact-{artifact.action}"></span>
+        <div class="artifacts-list-wrapper">
+          <div class="artifacts-list-container" use:artifactsListScrollAction>
+            {#each message.artifacts as artifact}
               <div
-                class="artifact-icon"
-                use:setElementIcon={artifact.getIconName()}
-              ></div>
-              <span class="artifact-name">{basename(artifact.filePath)}</span>
-              <span class="artifact-action artifact-action-{artifact.action}">{artifactActionToCopy(artifact.action)}</span>
-            </div>
-          {/each}
+                class="artifact-card"
+                aria-label="{artifact.filePath}"
+              >
+                <span class="artifact-ellipse artifact-ellipse-{artifact.action}"></span>
+                <div
+                  class="artifact-icon"
+                  use:setElementIcon={artifact.getIconName()}
+                ></div>
+                <span class="artifact-name">{basename(artifact.filePath)}</span>
+                <span class="artifact-action artifact-action-{artifact.action}">{artifactActionToCopy(artifact.action)}</span>
+              </div>
+            {/each}
+          </div>
+          <div class="artifacts-list-fade" class:hidden={isScrolledToBottom}></div>
         </div>
       </div>
     {/if}
@@ -169,9 +193,14 @@
     margin-left: var(--size-4-1);
   }
 
-  .artifacts-list-container {
+  .artifacts-list-wrapper {
     grid-row: 2;
     grid-column: 1 / 3;
+    position: relative;
+    width: 100%;
+  }
+
+  .artifacts-list-container {
     display: flex;
     flex-direction: column;
     overflow: scroll;
@@ -184,6 +213,22 @@
     display: none;
   }
 
+  .artifacts-list-fade {
+    position: absolute;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    height: var(--size-4-8);
+    background-image: linear-gradient(to bottom, transparent, var(--background-secondary));
+    pointer-events: none;
+    opacity: 1;
+    transition: opacity 0.2s ease-out;
+  }
+
+  .artifacts-list-fade.hidden {
+    opacity: 0;
+  }
+
   .artifact-card {
     display: grid;
     grid-template-rows: auto;
@@ -195,6 +240,7 @@
     background-color: var(--background-secondary-alt);
     border-radius: var(--size-4-2);
     padding: 0 var(--size-4-1) 0 var(--size-4-2);
+    cursor: pointer;
   }
 
   .artifact-ellipse {
@@ -207,16 +253,25 @@
     align-self: center;
   }
 
+  .artifact-card:hover .artifact-ellipse {
+    width: 12px;
+    height: 12px;
+    box-shadow: 0px 0px 4px 1px currentColor;
+  }
+
   .artifact-ellipse-create {
     background: var(--color-green);
+    color: var(--color-green);
   }
 
   .artifact-ellipse-modify {
     background: var(--color-blue);
+    color: var(--color-blue);
   }
 
   .artifact-ellipse-delete {
     background: var(--color-red);
+    color: var(--color-red);
   }
 
   .artifact-icon {

Components/ChatPlanArea.svelte

@@ -19,6 +19,8 @@
     let stepElements: (HTMLDivElement | null)[] = [];
     let isTransitioning = false;
     let resizeObserver: ResizeObserver | null = null;
+    let isScrolledToTop = true;
+    let isScrolledToBottom = true;
 
     $: steps = $executionPlanState.plan?.executionSteps;
     $: activeStepIndex = $executionPlanState.currentStepIndex;
@@ -65,6 +67,8 @@
 
         const stepsToShow = Math.min(3, steps.length);
         collapsedHeight = (stepsToShow * stepHeight) + (Math.max(0, stepsToShow - 1) * separatorHeight);
+
+        updateScrollFade();
     }
 
     onDestroy(() => {
@@ -73,6 +77,15 @@
         }
     });
 
+    function updateScrollFade() {
+        if (!wrapperDiv) {
+            return;
+        }
+        const { scrollTop, scrollHeight, clientHeight } = wrapperDiv;
+        isScrolledToTop = scrollTop < 1;
+        isScrolledToBottom = scrollHeight - scrollTop - clientHeight < 1;
+    }
+
     async function scrollToActiveStep() {
         if (!wrapperDiv || !$executionPlanState.plan || activeStepIndex === -1) {
             return;
@@ -124,7 +137,7 @@
          aria-label={expanded ? "Collapse planned steps" : "Expand planned steps"}
          role="button"
          tabindex=0>
-        <div id="chat-plan-steps-wrapper" style:height="{expanded ? expandedHeight : collapsedHeight}px" bind:this={wrapperDiv}>
+        <div id="chat-plan-steps-wrapper" style:height="{expanded ? expandedHeight : collapsedHeight}px" bind:this={wrapperDiv} on:scroll={updateScrollFade}>
             <div id="chat-plan-steps" bind:this={contentDiv}>
                 {#each steps as step, index }
                     <div class="chat-plan-step" bind:this={stepElements[index]}>
@@ -153,8 +166,8 @@
             </div>
         </div>
         {#if steps.length > 2}
-            <div class="chat-plan-fade top-fade" transition:fade></div>
-            <div class="chat-plan-fade bottom-fade" transition:fade></div>
+            <div class="chat-plan-fade top-fade" class:hidden={isScrolledToTop}></div>
+            <div class="chat-plan-fade bottom-fade" class:hidden={isScrolledToBottom}></div>
         {/if}
         <div id="chat-plan-chevron"
             class="transparent-button"
@@ -251,6 +264,12 @@
         border-radius: var(--radius-m);
         pointer-events: none;
         z-index: 1;
+        opacity: 1;
+        transition: opacity 0.2s ease-out;
+    }
+
+    .chat-plan-fade.hidden {
+        opacity: 0;
     }
 
     .top-fade {

Components/UserMessage.svelte

@@ -119,16 +119,16 @@
 	}
 
   .message-attachment-name {
-      display: inline-block;
-      white-space: nowrap;
-      width: 100%;
-      padding: 0;
-      font-size: var(--font-smaller);
+    display: inline-block;
+    white-space: nowrap;
+    width: 100%;
+    padding: 0;
+    font-size: var(--font-smaller);
   }
 
   .message-attachment-size {
-      padding: 0;
-      font-size: var(--font-smallest);
-      color: var(--text-muted);
+    padding: 0;
+    font-size: var(--font-smallest);
+    color: var(--text-muted);
   }
 </style>