chore: guard prompt reset timers

src/contentScript/index.ts

@@ -8,6 +8,7 @@ import { doesUrlMatchPatterns } from '../shared/url'
 const BLOCK_DATA_STATUS = 'coderchartStatus'
 const BLOCK_DATA_SOURCE = 'coderchartSource'
 const PNG_PREPARING_LABEL = 'Preparing PNG…'
+const PROMPT_RESET_DELAY_MS = 2000
 let diagramCounter = 0
 let blockIdentifierCounter = 0
 let observer: MutationObserver | null = null
@@ -737,9 +738,10 @@ function createErrorNotice(doc: Document, err: unknown, source: string): HTMLEle
     }
 
     setTimeout(() => {
+      if (!promptButton.isConnected) return
       promptButton.disabled = false
       promptButton.textContent = defaultLabel
-    }, 2000)
+    }, PROMPT_RESET_DELAY_MS)
   })
 
   promptSection.append(promptButton, promptStatus, promptPreview)

src/options/Options.tsx

@@ -1,17 +1,19 @@
-import { FormEvent, useEffect, useMemo, useState } from 'react'
+import { FormEvent, useEffect, useMemo, useRef, useState } from 'react'
 import { DEFAULT_SETTINGS, ExtensionSettings, getSettings, saveSettings, normalizeSettings } from '../shared/settings'
 
 import './Options.css'
 
 type SaveStatus = 'idle' | 'saving' | 'saved' | 'error'
 
 const defaultState = cloneSettings(DEFAULT_SETTINGS)
+const SAVE_STATUS_RESET_DELAY_MS = 2400
 
 export const Options = () => {
   const [settings, setSettings] = useState<ExtensionSettings>(defaultState)
   const [newPattern, setNewPattern] = useState('')
   const [status, setStatus] = useState<SaveStatus>('idle')
   const [errorMessage, setErrorMessage] = useState<string | null>(null)
+  const resetStatusTimeout = useRef<number | null>(null)
 
   useEffect(() => {
     let mounted = true
@@ -31,6 +33,14 @@ export const Options = () => {
     }
   }, [])
 
+  useEffect(() => {
+    return () => {
+      if (resetStatusTimeout.current !== null) {
+        window.clearTimeout(resetStatusTimeout.current)
+      }
+    }
+  }, [])
+
   const normalizedPatterns = useMemo(() => settings.hostPatterns.map((pattern) => pattern.trim()), [settings.hostPatterns])
 
   const canAddPattern = useMemo(() => {
@@ -74,16 +84,21 @@ export const Options = () => {
 
   const handleSubmit = async (event: FormEvent) => {
     event.preventDefault()
+    if (resetStatusTimeout.current !== null) {
+      window.clearTimeout(resetStatusTimeout.current)
+      resetStatusTimeout.current = null
+    }
     setStatus('saving')
     setErrorMessage(null)
     try {
       const normalized = normalizeSettings(settings)
       await saveSettings(normalized)
       setSettings(cloneSettings(normalized))
       setStatus('saved')
-      setTimeout(() => {
+      resetStatusTimeout.current = window.setTimeout(() => {
         setStatus('idle')
-      }, 2400)
+        resetStatusTimeout.current = null
+      }, SAVE_STATUS_RESET_DELAY_MS)
     } catch (error) {
       console.error('Failed to save settings', error)
       setStatus('error')