Media Assets Management Sidebar Tab Implementation (#6112)

## 📋 Overview
Implemented a new Media Assets sidebar tab in ComfyUI for managing
user-uploaded input files and generated output files. This feature
supports both local and cloud environments and is currently enabled only
in development mode.

## 🎯 Key Features

### 1. Media Assets Sidebar Tab
- **Imported** / **Generated** files separated by tabs
- Visual display with file preview cards
- Gallery view support (navigable with arrow keys)

### 2. Environment-Specific Implementation
- **`useInternalMediaAssets`**: For local environment
  - Fetches file list via `/files` API
  - Retrieves generation task execution time via `/history` API
  - Processes history data using the same logic as QueueSidebarTab
- **`useCloudMediaAssets`**: For cloud environment
  - File retrieval through assetService
  - History data processing using TaskItemImpl
- Auto-truncation of long filenames over 20 characters (e.g.,
`very_long_filename_here.png` → `very_long_...here.png`)

### 3. Execution Time Display
- Shows task execution time on generated image cards (e.g., "2.3s")
- Calculated from History API's `execution_start` and
`execution_success` messages
- Displayed at MediaAssetCard's duration chip location

### 4. Gallery Feature
- Full-screen gallery mode on image click
- Navigate between images with keyboard arrows
- Exit gallery with ESC key
- Reuses ResultGallery component from QueueSidebarTab

### 5. Development Mode Only
- Excluded from production builds using `import.meta.env.DEV` condition
- Feature in development, scheduled for official release after
stabilization

## 🛠️ Technical Changes

### New Files Added
- `src/components/sidebar/tabs/AssetsSidebarTab.vue` - Main sidebar tab
component
- `src/composables/sidebarTabs/useAssetsSidebarTab.ts` - Sidebar tab
definition
- `src/composables/useInternalMediaAssets.ts` - Local environment
implementation
- `src/composables/useCloudMediaAssets.ts` - Cloud environment
implementation
- `packages/design-system/src/icons/image-ai-edit.svg` - Icon addition

### Modified Files
- `src/stores/workspace/sidebarTabStore.ts` - Added dev mode only tab
display logic
- `src/platform/assets/components/MediaAssetCard.vue` - Added execution
time display, zoom event
- `src/platform/assets/components/MediaImageTop.vue` - Added image
dimension detection
- `packages/shared-frontend-utils/src/formatUtil.ts` - Added media type
determination utility functions
- `src/locales/en/main.json` - Added translation keys


[media_asset_OSS_cloud.webm](https://github.com/user-attachments/assets/a6ee3b49-19ed-4735-baad-c2ac2da868ef)

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: github-actions <github-actions@github.com>

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