fix(pr-2-jira): execute script on GitHub SPA navigation

Previously, the script only ran on initial page load. When navigating
between GitHub PR pages using the browser's SPA (Single Page
Application), the URL would change without a full page reload, so the
script wouldn't re-detect the page type or initialize features.

Added event listeners to detect and respond to URL changes:
- popstate: handles back/forward button navigation
- pushState override: detects when GitHub navigates without reload
- replaceState override: detects when GitHub replaces history states

Now the script automatically re-initializes whenever the user navigates
between GitHub PRs, eliminating the need to press F5 for the buttons to
appear.

Author: scharinger

scripts/pr-2-jira.js

@@ -1,7 +1,7 @@
 // ==UserScript==
 // @name         PR-2-Jira: GitHub & Jira Integration
 // @namespace    https://github.com/scharinger/userscripts
-// @version      2.3
+// @version      2.4
 // @description  Seamlessly connect GitHub PRs to Jira with smart button placement and automatic link creation
 // @author       Tim Scharinger
 // @match        https://*/*/pull/*
@@ -349,14 +349,42 @@
     }
   }
 
-  // Main initialization
-  const pageType = detectPageType()
-  console.log(`${PREFIX} Detected page type: ${pageType}`)
-  if (pageType === 'github') {
-    initializeGitHubFeatures()
-  } else if (pageType === 'jira') {
-    initializeJiraFeatures()
-  } else {
-    console.log(`${PREFIX} No matching page type found`)
+  // Main initialization function
+  function initialize() {
+    const pageType = detectPageType()
+    console.log(`${PREFIX} Detected page type: ${pageType}`)
+    if (pageType === 'github') {
+      initializeGitHubFeatures()
+    } else if (pageType === 'jira') {
+      initializeJiraFeatures()
+    } else {
+      console.log(`${PREFIX} No matching page type found`)
+    }
+  }
+
+  // Initialize on first load
+  initialize()
+
+  // Listen for GitHub's SPA navigation (back/forward, popstate)
+  window.addEventListener('popstate', () => {
+    console.log(`${PREFIX} URL changed (popstate), re-initializing...`)
+    initialize()
+  })
+
+  // Listen for pushState changes (when GitHub navigates without reload)
+  // We need to override history.pushState to detect navigation
+  const originalPushState = window.history.pushState
+  window.history.pushState = function (...args) {
+    originalPushState.apply(window.history, args)
+    console.log(`${PREFIX} URL changed (pushState), re-initializing...`)
+    initialize()
+  }
+
+  // Also listen for replaceState
+  const originalReplaceState = window.history.replaceState
+  window.history.replaceState = function (...args) {
+    originalReplaceState.apply(window.history, args)
+    console.log(`${PREFIX} URL changed (replaceState), re-initializing...`)
+    initialize()
   }
 })()