feat: add display name mappings for Essentials tab nodes (#9072)

## Summary

Add frontend-only display name mappings for nodes shown in the
Essentials tab, plus parse the new `essentials_category` field from the
backend.

## Changes

- **What**: Created `src/constants/essentialsDisplayNames.ts` with a
static mapping of node names to user-friendly display names (e.g.
`CLIPTextEncode` → "Text", `ImageScale` → "Resize Image"). Regular nodes
use exact name matching; blueprint nodes use prefix matching since their
filenames include model-specific suffixes. Integrated into
`NodeLibrarySidebarTab.vue`'s `renderedRoot` computed for leaf node
labels with fallback to `display_name`. Added `essentials_category`
(z.string().optional()) to the node def schema and `ComfyNodeDefImpl` to
parse the field already sent by the backend (PR #12357).

## Review Focus

Display names are resolved only in the Essentials tab tree view
(`NodeLibrarySidebarTab.vue`), not globally, to avoid side effects on
search, bookmarks, or other views. Blueprint prefix matching is ordered
longest-first so more specific prefixes (e.g. `image_inpainting_`) match
before shorter ones (e.g. `image_edit`).

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9072-feat-add-display-name-mappings-for-Essentials-tab-nodes-30f6d73d3650817c9acdc9b0315ed0be)
by [Unito](https://www.unito.io)

src/locales/en/main.json

@@ -3152,5 +3152,43 @@
       "duplicateName": "A secret with this name already exists",
       "duplicateProvider": "A secret for this provider already exists"
     }
+  },
+  "essentials": {
+    "loadImage": "Load Image",
+    "saveImage": "Save Image",
+    "loadVideo": "Load Video",
+    "saveVideo": "Save Video",
+    "load3DModel": "Load 3D model",
+    "save3DModel": "Save 3D Model",
+    "text": "Text",
+    "batchImage": "Batch Image",
+    "cropImage": "Crop Image",
+    "resizeImage": "Resize Image",
+    "rotate": "Rotate",
+    "invert": "Invert",
+    "canny": "Canny",
+    "removeBackground": "Remove Background",
+    "imageCompare": "Image compare",
+    "extractFrame": "Extract frame",
+    "loadStyleLora": "Load style (LoRA)",
+    "lipsync": "Lipsync",
+    "textGenerationLLM": "Text generation (LLM)",
+    "textTo3DModel": "Text to 3D model",
+    "imageTo3DModel": "Image to 3D Model",
+    "musicGeneration": "Music generation",
+    "loadAudio": "Load Audio",
+    "saveAudio": "Save Audio",
+    "inpaintImage": "Inpaint image",
+    "outpaintImage": "Outpaint image",
+    "imageToImage": "Image to image",
+    "textToImage": "Text to image",
+    "poseToImage": "Pose to image",
+    "cannyToImage": "Canny to image",
+    "depthToImage": "Depth to image",
+    "textToVideo": "Text to video",
+    "imageToVideo": "Image to video",
+    "poseToVideo": "Pose to video",
+    "cannyToVideo": "Canny to video",
+    "depthToVideo": "Depth to video"
   }
 }