Todo Panel — Item JIRA links + context menu + delete

[harrryyd]

Parent

#44

What to build

JIRA links on items with inheritance from category, right-click context menu on items, and item deletion with confirmation.

State machine: todoStore gains:

• setItemJiraLink(itemId, jiraLink?) — sets or clears the item's JIRA link
• deleteItem(itemId) — removes the item entirely (not archived, truly deleted)

UI:

• JIRA link display: If an item has its own jiraLink, display it as a clickable ticker/number. If not, inherit the category's jiraLink for display (the item's own jiraLink field stays undefined). An explicitly set item link overrides the inherited one.
• JIRA link editing: Via right-click context menu on the item. An input allows setting/clearing the link.
• Context menu: Right-clicking an item shows a context menu with options: "Edit JIRA Link", "Delete". Future slices may add more options here.
• Delete: Clicking "Delete" shows a confirmation dialog ("Delete this item?" with Cancel/Delete buttons). Confirming permanently removes the item.

Acceptance criteria

• Item JIRA link displayed as clickable ticker/number (extracted from URL for display)
• Items without their own JIRA link inherit the category's JIRA link for display
• Explicit item JIRA link overrides inherited category link
• Right-click context menu appears on items with "Edit JIRA Link" and "Delete" options
• JIRA link can be edited (set/clear) via context menu input
• Delete option shows confirmation dialog; confirming removes item permanently
• Cancelling the confirm dialog keeps the item
• Unit tests: setItemJiraLink, deleteItem, JIRA inheritance logic
• bun fmt, bun lint, bun typecheck all pass

Blocked by

• Todo Panel — Create items per category + WebSocket sync #47

[harrryyd]

Implemented and merged to main.