feat(KB-658): reduce ID column width and remove legacy dashboard components

- Reduce ID column width in list view for better space utilization
- Remove deprecated AgentsView component (consolidated into other views)
- Remove TaskChangesTab component (replaced by unified diff viewer)
- Add project-runtime.ts foundation for multi-project runtime architecture
- Fix duplicate variable declaration in SettingsModal
- Update tests for removed components and new hooks behavior

packages/dashboard/app/styles.css

@@ -4798,6 +4798,11 @@ body {
   padding-right: 8px;
 }
 
+/* Set width on ID column header to match data cells */
+.list-table th:nth-child(2).list-header-cell {
+  width: 70px;
+}
+
 .list-header-cell:hover {
   color: var(--text);
 }
@@ -4859,6 +4864,7 @@ body {
 }
 
 .list-cell-id {
+  width: 70px;
   font-family: var(--font-mono);
   font-size: 12px;
   font-weight: 600;
@@ -4868,7 +4874,6 @@ body {
 }
 
 .list-cell-title {
-  max-width: 300px;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
@@ -5128,7 +5133,9 @@ body {
   }
 
   .list-cell-title {
-    max-width: 150px;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
   }
 
   .list-cell-date {