feat(integrations): sprint 2 — webhooks UI, CSV/Trello importers, action-aware notifications

[parth0025]

Sprint 2 — Integrations & Importers

Verified end-to-end against a local instance: Slack, Discord, and JSON webhooks all delivering; CSV + Trello imports landing tasks.

Integrations (Settings → Integrations) — S2-01 / S2-03

• New Integrations settings page to manage Slack / Discord / JSON outgoing webhooks: per-event subscriptions, secret, enable toggle, and delivery logs.
• Action-aware notifications — instead of a generic "Task updated" with the same two fields, the message names the actual action (Status changed, Assignees updated, Priority changed, Renamed, Due date updated, Estimate updated, …) and shows only the relevant field.
• from → to diffs — e.g. Status: To Do → In Progress, via a per-task snapshot cache; assignee/lead ids resolved to names.
• Create now fires exactly one task.created — suppresses create-flow churn (TaskKey assignment, counter/index writes) and the project-counter phantom emit; the full task is re-read before delivery so payloads are complete.

Importers (project filter toolbar) — S2-04 / S2-05

• CSV and Trello importers mirroring the existing Jira importer; map columns / lists onto the project's statuses and bulk-create through the same createMultipleTasks pipeline (keys, counters, sockets all native).
• Statuses now resolve from the project's own taskStatusData (guaranteed type/key) so imports never fail statusType validation on projects with custom statuses; the Jira importer was routed through the same shared helper (fixes a latent bug there too).
• Downloadable sample template in all three import modals.

Tasks

• Removed the automatic AI time estimate on task creation (it fired a spurious task.updated); the estimate is now manual-only (sidebar button + AI project generator still use it).

Testing

• 198 unit tests passing (webhook-rules, csv-rules, trello-rules).
• Manually verified: Slack/Discord/JSON deliveries, action-aware + from→to formatting, CSV + Trello imports.

Notes

• S2-02 (n8n community node) is intentionally out of scope — it belongs in a separate n8n-nodes-alianhub package, not this repo.
• Local-only files (.claude/settings.local.json, throwaway .claude/import-samples/) were left out.

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