* feat(web): @-mention tasks in the chat composer
Lets users type @<taskname> in the chat input to reference other tasks.
The picked task is inserted as a chip and its metadata (id, workflow_id,
step, state) is appended to the prompt as a <kandev-system> block so the
agent can act on it via the kandev MCP tools.
Extends the existing TipTap mention extension with a new "task" kind;
task data comes from the kanban store (current workflow + visited
kanbanMulti snapshots), so no backend changes are needed.
* fix(web): harden task @-mentions from review feedback (#963)
- Sanitize interpolated task strings (title, id, workflow_id, step,
state) before they land in the <kandev-system> block so a hostile
task title (e.g. from Jira/Linear sync) can't terminate the block
early via embedded newlines or angle brackets.
- Expand the task-mentions context block on the onSend code path too
(used by preview-session-tabs), which was silently dropping the
agent-facing task context when chips were present in the editor.
- Deduplicate task mentions by taskId in getTaskMentions so mentioning
the same task twice no longer produces redundant lines.
- Skip stale state.kanban.tasks entries whose workflowStepId isn't in
the current workflow's steps to prevent tagging them with the wrong
workflow_id.
* fix(web): skip task mentions missing workflowId or workflowStepId (#963)
CodeRabbit flagged that getTaskMentions was filling missing
workflowId / workflowStepId with empty strings, propagating malformed
metadata into the prompt block. Skip such nodes during extraction.
---------
Co-authored-by: Kandev Agent <agent@kandev.dev>
João Salavisa