Keep replay and history prompts tied to the right task

[09Catho]

This fixes two closely related prompt mixups in the project replay/history flow.

When replaying a finished task, the app could grab the first prompt it found anywhere in the project instead of the prompt that belonged to the task you actually replayed. Reopening a multi-task project from history had the same shape of bug: every restored task could inherit one shared question instead of its own original prompt.

What changed:

• replay now reads the active task's own first user message
• history loading now carries a per-task question map so each restored task keeps its own prompt
• the history entry points were updated to pass those task-specific prompts through
• regression tests were added for both the replay path and multi-task history reload path
• the relevant test mocks were refreshed so those regression tests can actually run

Closes #1367
Closes #1366

Tested with:

• npx vitest run test/integration/chatStore/replayComplete.test.tsx -t "active task question|per-task questions|correct first question on replayActiveTask"
• npm run type-check