enhance: Adjust Workflow Graph styling (#37497)

- Fix workflow dependency graph overflow by making the graph container
scrollable (no more clipped DAGs; addresses #37493).
- Improve Actions job list readability by keeping durations
fixed-width/right-aligned so long times don’t squeeze job names.
- Make workflow graph layout more intuitive by vertically centering
shorter columns to reduce misleading “looks like it depends on”
alignments (addresses #37395).

### Screenshot
<img width="966" height="439"
src="https://github.com/user-attachments/assets/c180c5a2-4f56-4287-bcaa-f2735ba72949"
/>

<img width="949" height="559"
src="https://github.com/user-attachments/assets/a383511d-a962-4920-b792-69f556847eff"
/>



Fixes #37493
Fixes #37395

---------

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Claude (Opus 4.7) <noreply@anthropic.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

web_src/js/components/ActionRunView.ts

@@ -104,12 +104,6 @@ export function buildJobsByParentJobID(jobs: ActionsJob[]): Map<number, ActionsJ
   return childrenByParent;
 }
 
-// collectCallerChildJobs returns the direct children of a caller job.
-export function collectCallerChildJobs(jobs: ActionsJob[], callerJobID: number): ActionsJob[] {
-  if (!callerJobID) return [];
-  return buildJobsByParentJobID(jobs).get(callerJobID) || [];
-}
-
 export function createEmptyActionsRun(): ActionsRun {
   return {
     repoId: 0,