fix: remove timeouts from error toasts so they persist until dismissed (#9543)

## Summary

Remove `life` (timeout) property from all error-severity toast calls so
they persist until manually dismissed, preventing users from missing
important error messages.

## Changes

- **What**: Removed `life` property from 86 error toast calls across 46
files. Error toasts now use PrimeVue's default behavior (no
auto-dismiss). Non-error toasts (success, warn, info) are unchanged.
- Also fixed a pre-existing lint issue in `TaskListPanel.vue` (`import {
t } from '@/i18n'` → `useI18n()`)

## Review Focus

- One conditional toast in `useMediaAssetActions.ts` intentionally keeps
`life` because its severity alternates between `warn` and `error`

Fixes
https://www.notion.so/comfy-org/Implement-Remove-timeouts-for-all-error-toasts-31b6d73d365081cead54fddc77ae7c3d

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9543-fix-remove-timeouts-from-error-toasts-so-they-persist-until-dismissed-31c6d73d365081fa8d30f6366e9bfe38)
by [Unito](https://www.unito.io)

src/composables/useCoreCommands.ts

@@ -397,8 +397,7 @@ export function useCoreCommands(): ComfyCommand[] {
         if (app.canvas.empty) {
           toastStore.add({
             severity: 'error',
-            summary: t('toastMessages.emptyCanvas'),
-            life: 3000
+            summary: t('toastMessages.emptyCanvas')
           })
           return
         }
@@ -557,8 +556,7 @@ export function useCoreCommands(): ComfyCommand[] {
           toastStore.add({
             severity: 'error',
             summary: t('toastMessages.nothingToQueue'),
-            detail: t('toastMessages.pleaseSelectOutputNodes'),
-            life: 3000
+            detail: t('toastMessages.pleaseSelectOutputNodes')
           })
           return
         }
@@ -571,8 +569,7 @@ export function useCoreCommands(): ComfyCommand[] {
           toastStore.add({
             severity: 'error',
             summary: t('toastMessages.failedToQueue'),
-            detail: t('toastMessages.failedExecutionPathResolution'),
-            life: 3000
+            detail: t('toastMessages.failedExecutionPathResolution')
           })
           return
         }
@@ -602,8 +599,7 @@ export function useCoreCommands(): ComfyCommand[] {
           toastStore.add({
             severity: 'error',
             summary: t('toastMessages.nothingToGroup'),
-            detail: t('toastMessages.pleaseSelectNodesToGroup'),
-            life: 3000
+            detail: t('toastMessages.pleaseSelectNodesToGroup')
           })
           return
         }
@@ -962,8 +958,7 @@ export function useCoreCommands(): ComfyCommand[] {
           toastStore.add({
             severity: 'error',
             summary: t('g.error'),
-            detail: t('manager.notAvailable'),
-            life: 3000
+            detail: t('manager.notAvailable')
           })
           return
         }
@@ -1048,8 +1043,7 @@ export function useCoreCommands(): ComfyCommand[] {
           toastStore.add({
             severity: 'error',
             summary: t('toastMessages.cannotCreateSubgraph'),
-            detail: t('toastMessages.failedToConvertToSubgraph'),
-            life: 3000
+            detail: t('toastMessages.failedToConvertToSubgraph')
           })
           return
         }
@@ -1258,8 +1252,7 @@ export function useCoreCommands(): ComfyCommand[] {
             summary: t('g.error'),
             detail: t('g.commandProhibited', {
               command: 'Comfy.Memory.UnloadModels'
-            }),
-            life: 3000
+            })
           })
           return
         }
@@ -1278,8 +1271,7 @@ export function useCoreCommands(): ComfyCommand[] {
             summary: t('g.error'),
             detail: t('g.commandProhibited', {
               command: 'Comfy.Memory.UnloadModelsAndExecutionCache'
-            }),
-            life: 3000
+            })
           })
           return
         }