[bugfix] fix @intlify/vue-i18n/no-raw-text linting errors (#6280)

## Summary

This PR fixes all @intlify/vue-i18n/no-raw-text linting errors
identified in #5625 by replacing raw text strings with proper i18n
translation function calls.

## Changes

Fixed i18n linting errors in the following files:
- `src/components/widget/SampleModelSelector.vue` - "Upload Model" →
`$t('g.upload')`
- `src/components/topbar/CurrentUserButton.vue` - "user profile" →
`$t('g.currentUser')`
- `src/components/sidebar/tabs/nodeLibrary/NodeHelpPage.vue` - "Loading
help" → `$t('g.loading')`
- `src/components/sidebar/SidebarShortcutsToggleButton.vue` -
"shortcuts.shortcuts" → `$t('shortcuts.shortcuts')`
- `src/components/sidebar/SidebarLogoutIcon.vue` - "sideToolbar.logout"
→ `$t('sideToolbar.logout')`
- `src/components/sidebar/SidebarHelpCenterIcon.vue` - "menu.help" →
`$t('menu.help')`
- `src/components/sidebar/SidebarBottomPanelToggleButton.vue` -
"sideToolbar.labels.console" → `$t('sideToolbar.labels.console')`
- `src/components/load3d/controls/viewer/ViewerCameraControls.vue` -
"fov" → `t('load3d.fov')`
- `src/components/helpcenter/HelpCenterMenuContent.vue` - "Help Center
Menu" and "Recent releases" → `$t()` calls

All raw text strings have been replaced with appropriate i18n
translation keys that already exist in `src/locales/en/main.json`.

## Related Issue

Fixes errors reported in CI job:
https://github.com/Comfy-Org/ComfyUI_frontend/actions/runs/18705105609/job/53341658467?pr=5625

This PR aims to help #5625 pass CI/CD checks.

## Test Plan

- All i18n linting errors should be resolved
- No functionality changes - only proper use of i18n system
- Existing translation keys are used from the locale files

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6280-bugfix-fix-intlify-vue-i18n-no-raw-text-linting-errors-2976d73d365081369b43de01486fb409)
by [Unito](https://www.unito.io)

---------

Co-authored-by: GitHub Action <action@github.com>

src/components/sidebar/tabs/nodeLibrary/NodeHelpPage.vue

@@ -16,7 +16,7 @@
       <ProgressSpinner
         v-if="isLoading"
         class="m-auto"
-        aria-label="Loading help"
+        :aria-label="$t('g.loading')"
       />
       <!-- Markdown fetched successfully -->
       <div