Read-only task page: Advanced fields and the e2e

Found while checking Task 7228 on a local stack (operator e2e-smoke, "All orgs", another org's locked task `/tasks/41`). 1. **Advanced fields still look live on a read-only task.** Persona, Agent, Model, Priority and Project memory show full borders and carets, and the Hidden checkbox looks enabled. Give them the same read-only treatment as Assigned to (no caret, dimmed), or show their values as plain text. 2. **An empty Description box reads as a blank editor.** On a read-only task with a short body, the bordered box fills ~270px of empty space. Size it to its content when read-only. 3. **The 1024x768 block of `e2e/task-detail-fit.spec.ts` fails on a local pool stack.** Every case waits on a loading pane and never finds `task-crumb-title`, with or without Task 7228's diff. Find why the routed task detail never loads locally, and fix it so the spec runs on a slot stack. Out of scope: act-as semantics; the Assigned to and axis controls (Task 7228). Done means: - Each item fixed with a test, or declined with the reason in the report. - A screenshot of each fixed surface in the report.

Read-only task: Advanced fields have no carets, Description sizes to its prose; fit spec runs on a slot stack (a cold Vite load beat the 5s wait; stale chip case updated). Tests + screenshots. Web stages green; local full-gate reds were develop-side. PR #6021 merged. Follow-up draft 7403.