refactor: rename internal promptId/PromptId to jobId/JobId (#8730)

## Summary

Rename all internal TypeScript usage of legacy `promptId`/`PromptId`
naming to `jobId`/`JobId` across ~38 files for consistency with the
domain model.

## Changes

- **What**: Renamed internal variable names, type aliases, function
names, class getters, interface fields, and comments from
`promptId`/`PromptId` to `jobId`/`JobId`. Wire-protocol field names
(`prompt_id` in Zod schemas and `e.detail.prompt_id` accesses) are
intentionally preserved since they match the backend API contract.

## Review Focus

- All changes are pure renames with no behavioral changes
- Wire-protocol fields (`prompt_id`) are deliberately unchanged to
maintain backend compatibility
- Test fixtures updated to use consistent `job-id` naming

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8730-refactor-rename-internal-promptId-PromptId-to-jobId-JobId-3016d73d3650813ca40ce337f7c5271a)
by [Unito](https://www.unito.io)

src/views/GraphView.vue

@@ -132,12 +132,10 @@ if (isDesktop) {
     (newTasks, oldTasks) => {
       // Report tasks that previously running but are now completed (i.e. in history)
       const oldRunningTaskIds = new Set(
-        oldTasks.filter((task) => task.isRunning).map((task) => task.promptId)
+        oldTasks.filter((task) => task.isRunning).map((task) => task.jobId)
       )
       newTasks
-        .filter(
-          (task) => oldRunningTaskIds.has(task.promptId) && task.isHistory
-        )
+        .filter((task) => oldRunningTaskIds.has(task.jobId) && task.isHistory)
         .forEach((task) => {
           electronAPI().Events.incrementUserProperty(
             `execution:${task.displayStatus.toLowerCase()}`,