feat: automatically fit view when loading templates (#8749)

## Description

When loading a template workflow, always call `fitView()` to ensure the
template is properly framed within the viewport. This provides a better
initial viewing experience for users.

## Problem

Previously, templates with embedded viewport positions (`extra.ds`)
would load at arbitrary positions, sometimes showing a blank canvas.
Users had to navigate significantly to find the workflow content.

## Solution

Added a single condition in `loadGraphData()` to check if `openSource
=== 'template'` and force `fitView()` when true, bypassing the saved
viewport position.

This change only affects template loading - normal workflow loading
behavior remains unchanged.

## Changes

- `src/scripts/app.ts`: Added condition to always call `fitView()` when
loading templates

## Testing

- Load various templates from the template selector
- Verify the workflow is fully visible and centered on load
- Verify normal workflow loading still respects saved positions

## Related

- Fixes COM-14156
- Related to COM-10087 (Center view on workflow when loading templates -
Done)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8749-feat-automatically-fit-view-when-loading-templates-3016d73d36508167a63de2ae407de7b8)
by [Unito](https://www.unito.io)

src/scripts/app.ts

@@ -1250,7 +1250,10 @@ export class ComfyApp {
         restore_view &&
         useSettingStore().get('Comfy.EnableWorkflowViewRestore')
       ) {
-        if (graphData.extra?.ds) {
+        // Always fit view for templates to ensure they're visible on load
+        if (openSource === 'template') {
+          useLitegraphService().fitView()
+        } else if (graphData.extra?.ds) {
           this.canvas.ds.offset = graphData.extra.ds.offset
           this.canvas.ds.scale = graphData.extra.ds.scale