Feat: Add recordUrl field for pageAction editor

[Copilot]

startUrl was serving dual purposes: execution target and recorder launch URL. This conflates two distinct concerns — e.g. startUrl may be a wildcard pattern for matchesPageActionUrl, making it unsuitable as a concrete recorder navigation URL.

Changes

• New recordUrl?: string field on PageActionOption — used exclusively when launching the recorder; ignored at execution time
• Editor UI — recordUrl input added below startUrl in PageActionSection; REC button enables when either URL is set
• Recorder launch (CommandEditDialog) — uses recordUrl || startUrl as the navigation target when opening the recorder window; stores recordUrl in PA_RECORDING session data
• Reset handler (background.ts) — reloads recording tab to recordUrl || startUrl on reset
• Type + schema — recordUrl added to PageActionOption type and Zod schema (optional)
• i18n — translations added for all 14 locales

export type PageActionOption = {
  startUrl: string    // used for execution + matchesPageActionUrl
  recordUrl?: string  // used only when opening the recorder
  openMode: PAGE_ACTION_OPEN_MODE
  steps: Array<PageActionStep>
  userVariables?: Array<UserVariable>
}

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