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/utils/queueDisplay.ts

@@ -43,7 +43,7 @@ export const iconForJobState = (state: JobState): string => {
 
 const buildTitle = (task: TaskItemImpl, t: (k: string) => string): string => {
   const prefix = t('g.job')
-  const shortId = String(task.promptId ?? '').split('-')[0]
+  const shortId = String(task.jobId ?? '').split('-')[0]
   const idx = task.queueIndex
   if (typeof idx === 'number') return `${prefix} #${idx}`
   if (shortId) return `${prefix} ${shortId}`