feat: add Logo C fill and Comfy wave loading indicator components (#9433)

## Summary

Add SVG-based brand loading indicators (LogoCFillLoader,
LogoComfyWaveLoader) and use the wave loader as the app loading screen.

## Changes

- **What**: New `LogoCFillLoader` (bottom-to-top fill, plays once) and
`LogoComfyWaveLoader` (wave water-fill animation) components with
`size`, `color`, `bordered`, and `disableAnimation` props. Move all
loaders from `components/common/` to `components/loader/`. Use
`LogoComfyWaveLoader` in `App.vue` and `WorkspaceAuthGate.vue`. Render
loader above BlockUI overlay (z-1200) to prevent dim wash-out.
- **Dependencies**: None

## Review Focus

- SVG mask-based animation approach using `currentColor` for flexible
theming
- z-index layering: loader at z-1200 renders above PrimeVue BlockUI's
z-1100 modal overlay
- `disableAnimation` prop used in WorkspaceAuthGate to show static logo
outline during auth loading

## Screenshots (if applicable)

[loading_record.webm](https://github.com/user-attachments/assets/b34f7296-9904-4a42-9273-a7d5fda49d15)

Storybook stories added for both components under `Components/Loader/`.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9433-feat-add-Logo-C-fill-and-Comfy-wave-loading-indicator-components-31a6d73d3650811cacfdcf867b1f835f)
by [Unito](https://www.unito.io)

---------

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

src/App.vue

@@ -1,13 +1,13 @@
 <template>
   <router-view />
-  <div
-    v-if="isLoading"
-    class="absolute inset-0 flex items-center justify-center"
-  >
-    <Loader size="lg" class="text-white" />
-  </div>
   <GlobalDialog />
   <BlockUI full-screen :blocked="isLoading" />
+  <div
+    v-if="isLoading"
+    class="pointer-events-none fixed inset-0 z-1200 flex items-center justify-center"
+  >
+    <LogoComfyWaveLoader size="xl" color="yellow" />
+  </div>
 </template>
 
 <script setup lang="ts">
@@ -15,7 +15,7 @@ import { captureException } from '@sentry/vue'
 import BlockUI from 'primevue/blockui'
 import { computed, onMounted } from 'vue'
 
-import Loader from '@/components/common/Loader.vue'
+import LogoComfyWaveLoader from '@/components/loader/LogoComfyWaveLoader.vue'
 import GlobalDialog from '@/components/dialog/GlobalDialog.vue'
 import config from '@/config'
 import { useWorkspaceStore } from '@/stores/workspaceStore'