[Feature]: One-way #N mentions in descriptions and notes (not bidirectional links)

[rosspeili]

One-line summary

Render #123 in description/notes as clickable pills with hover preview; mentions are one-way (unlike Linked issues).

Problem / motivation

Users reference other tasks in prose without wanting a formal bidirectional link. Linked issues create A↔B. Mentions should be A→B only: task 1 can mention #2 without #2 gaining a link back to 1.

Proposed solution

• Detect # + issue number in description and notes (title only if safe).
• Style as pills (same visual family as link chips).
• Click → open that issue in the drawer.
• Hover → mini preview (title + priority/tracker).
• Do not write reverse entries into the linked-issues graph.
• Unknown/deleted # → muted or plain text.

Implementer notes: Shared pill component with bidirectional: false; resolve via store; word-boundary rules so file#1 isn’t a false mention; docs distinguish Links vs Mentions. Coordinate with title/description fidelity work. Out of scope: subtasks; cross-project mentions; # autocomplete (follow-up).

Alternatives considered

• Reuse Linked issues only (wrong semantics).
• Autocomplete # while typing (nice follow-up).

Primary surface

Task drawer

Constraints you accept

• Must stay local-first (no required cloud account)
• Should not break existing tracker *.md readability

Mock / sketch / reference (optional)

Inline #308 in notes becomes a pastel pill; hover card shows issue title like link hover.