enhance(actions): Make Summary UI more beautiful with more infos (#37824)

## Summary

- Redesign the Actions run summary header to follow GitHub Actions
layout: trigger info on the left, Status / Total duration / Artifacts
columns inline on the right
- Expose trigger user avatar, pull request link, and PR head branch info
from the run view API
- Update the workflow graph header to show the workflow filename (linked
to the run workflow file) and `on: <event>`, while keeping the
jobs/dependencies/success stats line
- Remove the redundant commit/workflow metadata row below the run title;
that information now lives in the summary bar

New:
<img width="1564" height="639"
src="https://github.com/user-attachments/assets/e6bc1623-c5fc-4e97-abc9-fde7f3c6aef9"
/>

Old:
<img width="2038" height="1038"
src="https://github.com/user-attachments/assets/0857f19a-8d3a-4da2-82fd-e9ebeb200062"
/>

Replaces https://github.com/go-gitea/gitea/pull/36721

---------

Co-authored-by: Giteabot <teabot@gitea.io>

web_src/js/modules/gitea-actions.ts

@@ -23,6 +23,10 @@ export type ActionsRun = {
   duration: string,
   triggeredAt: number,
   triggerEvent: string,
+  pullRequest?: {
+    index: string,
+    link: string,
+  } | null,
   jobs: Array<ActionsJob>,
   commit: {
     localeCommit: string,
@@ -32,6 +36,7 @@ export type ActionsRun = {
     pusher: {
       displayName: string,
       link: string,
+      avatarLink: string,
     },
     branch: {
       name: string,
@@ -51,6 +56,7 @@ export type ActionsRunAttempt = {
   triggeredAt: number;
   triggerUserName: string;
   triggerUserLink: string;
+  triggerUserAvatar: string;
 };
 
 export type ActionsJob = {