Routines: add Edit affordance for existing routines (CL-6680)

[TheGreatAxios]

Summary

• Routines list: each row gets an "Edit" action beside Run now/Resume, opening the routine in the canvas editor panel by id.
• Routine detail page: an "Edit" button sits in the header next to Run now/Pause, same outline/sm style, opening the same editor.
• Both call openRoutine({ routineId }) (useOpenRoutineInCanvas), reusing the existing edit-mode load path in routine-panel.tsx — no new editor logic.

Test plan

• WORKBENCH_CHECK_SINCE=origin/main bun run typecheck
• WORKBENCH_CHECK_SINCE=origin/main bun run test
• bun run lint