fix: allow closing last session tab and restore DevTools shortcut

Closing the sole remaining non-welcome tab now resets to welcome; enable Tauri devtools, menu/shortcut toggle, and copy release artifacts from CARGO_TARGET_DIR.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/components/common/CommandPalette.tsx

@@ -143,7 +143,8 @@ export function CommandPalette({
         shortcut: 'Ctrl+W',
         icon: <X size={16} />,
         action: () => {
-          if (activeTabId && tabs.length > 1) {
+          const active = tabs.find((tab) => tab.id === activeTabId)
+          if (activeTabId && (tabs.length > 1 || active?.type !== 'welcome')) {
             void disposeAndCloseTab(activeTabId)
           }
         },

src/components/terminal/TerminalWorkspace.tsx

@@ -912,7 +912,8 @@ export default function TerminalWorkspace({ tabId, isActive = true }: TerminalVi
       closePane(paneId)
       return
     }
-    if (tabs.length <= 1) return
+    const onlyTab = tabs.length === 1 ? tabs[0] : null
+    if (tabs.length <= 1 && (!onlyTab || onlyTab.type === 'welcome' || onlyTab.id !== tabId)) return
 
     const connectionId = connectionIdRef.current
     const paneShells = panesRef.current.flatMap((pane) => pane.shellId ? [pane.shellId] : [])
@@ -935,7 +936,7 @@ export default function TerminalWorkspace({ tabId, isActive = true }: TerminalVi
       }
       closeTab(tabId)
     })()
-  }, [closePane, closeTab, connectionIdRef, tabId, tabs.length])
+  }, [closePane, closeTab, connectionIdRef, tabId, tabs])
 
   const openTerminalContextMenu = useCallback((
     paneId: string,
@@ -1246,7 +1247,7 @@ export default function TerminalWorkspace({ tabId, isActive = true }: TerminalVi
           hasSelection={contextMenu.hasSelection}
           canSplit={connectionState === 'connected'}
           canClosePane={panes.length > 1}
-          canCloseTerminal={panes.length > 1 || tabs.length > 1}
+          canCloseTerminal={panes.length > 1 || tabs.length > 1 || tabs[0]?.type !== 'welcome'}
           closeLabel={panes.length > 1 ? t('toolbar.closePaneLabel') : t('toolbar.closeTabLabel')}
           maximized={maximizedPaneId === contextMenu.paneId}
           onClose={() => setContextMenu(null)}