feat/fix: App mode QA feedback 2 (#9511)

## Summary

Additional fixes and updates based on testing

## Changes

- **What**: 
- add warning to welcome screen & when sharing an app that has had all
outputs removed
- fix target workflow when changing mode via tab right click menu
- change build app text to be conditional "edit" vs "build" depending on
if an app is already defined
- update empty apps sidebar tab button text to make it clearer
- remove templates button from app mode (we will reintroduce this once
we have app templates)
- add "exit to graph" after applying default mode of node graph
- update cancel button to remove item from queue if it hasn't started
yet
- improve scoping of jobs/outputs to the current workflow [not perfect
but should be much improved]
- close sidebar tabs on entering app mode
- change tooltip to be under the workflow menu rather than covering the
button

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9511-feat-fix-App-mode-QA-feedback-2-31b6d73d365081d59bbbc13111100d46)
by [Unito](https://www.unito.io)

src/components/appMode/AppModeToolbar.vue

@@ -7,7 +7,6 @@ import { useErrorHandling } from '@/composables/useErrorHandling'
 import { useFeatureFlags } from '@/composables/useFeatureFlags'
 import Button from '@/components/ui/button/Button.vue'
 import { useAppMode } from '@/composables/useAppMode'
-import { useWorkflowTemplateSelectorDialog } from '@/composables/useWorkflowTemplateSelectorDialog'
 import { isCloud } from '@/platform/distribution/types'
 import {
   openShareDialog,
@@ -44,10 +43,6 @@ function openAssets() {
 function showApps() {
   void commandStore.execute('Workspace.ToggleSidebarTab.apps')
 }
-
-function openTemplates() {
-  useWorkflowTemplateSelectorDialog().show('sidebar')
-}
 </script>
 
 <template>
@@ -116,19 +111,6 @@ function openTemplates() {
       >
         <i class="icon-[lucide--panels-top-left] size-4" />
       </Button>
-      <Button
-        v-tooltip.right="{
-          value: t('sideToolbar.templates'),
-          ...tooltipOptions
-        }"
-        variant="textonly"
-        size="unset"
-        :aria-label="t('sideToolbar.templates')"
-        class="size-10"
-        @click="openTemplates"
-      >
-        <i class="icon-[comfy--template] size-4" />
-      </Button>
     </div>
   </div>
 </template>