Add editable task titles

[robinnewhouse]

Summary

• add a stored task title field with backward-compatible prompt-derived defaults
• let users edit titles directly from task creation, inline editing, and a dedicated title dialog
• remove the regenerate-title action in favor of explicit title editing and cover the new flows with tests

We can later add functionality to make the prompt actually generated with llm

Testing

• npm run check
• npm --prefix web-ui run test -- src/components/board-card.test.tsx src/components/card-detail-view.test.tsx src/hooks/use-task-editor.test.tsx src/components/detail-panels/column-context-panel.test.tsx src/components/kanban-board.test.tsx

Screen.Recording.2026-03-20.at.1.54.01.PM.mov

[saoudrizwan]

need to check that this doesnt cause issues with the kanban agent using a title in the kanban task create command

[abeatrix]

not sure if we are using it already but the sdk session has a function called "updateSession" for this exact use case so just want to make sure we are using that :D