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* feat(labels): add issue label CRUD + attach/detach handlers (#1191) The issue_label and issue_to_label tables were scaffolded in 001_init.up.sql but never wired to any code path. This commit ships the backend for #1191: - Migration 048: adds created_at/updated_at timestamps + workspace-scoped case-insensitive unique index on label names - sqlc queries for label CRUD + issue<->label attach/detach + batch list (ListLabelsByIssueIDs for board/list views) - HTTP handlers: /api/labels CRUD, /api/issues/{id}/labels attach/detach - Protocol events: label:{created,updated,deleted} + issue_labels:changed - Handler tests covering CRUD, duplicate-name conflict, invalid-color, attach/detach idempotency, and cross-workspace isolation * feat(cli): add label and issue label subcommands (#1191) - multica label {list,get,create,update,delete} - multica issue label {list,add,remove} Both follow existing CLI conventions (JSON/table output, flag shapes) and exercise the /api/labels endpoints shipped in the previous commit. * feat(web): add labels UI — picker with inline create + management dialog (#1191) Exposes the backend label feature to users via the existing issue-detail sidebar. - `@multica/core/types/label` — Label, CreateLabelRequest, UpdateLabelRequest, plus response envelopes - `@multica/core/api/client` — 8 methods for label CRUD and issue↔label attach/detach - `@multica/core/labels` — labelKeys, queryOptions, and mutation hooks with optimistic updates (matches the project/ module layout) - WS event type literals extended for label:{created,updated,deleted} and issue_labels:changed - `views/labels/label-chip.tsx` — colored pill; uses relative luminance (ITU-R BT.601) to pick #111827 or #f9fafb text so chips stay readable on both pastel and saturated backgrounds - `views/issues/components/pickers/label-picker.tsx` - Multi-select combobox in the issue sidebar - When 0 labels: "Add label" trigger - When 1+ labels: the chips themselves are the trigger; × on each chip detaches without opening the picker - Inline create: typing a new name + Enter creates with a hash-derived color and attaches in one motion (matches Linear/GitHub) - "Manage labels…" footer opens a dialog containing the full workspace panel — users never leave the issue context to rename/recolor/delete - `views/issues/components/labels-panel.tsx` — workspace labels manager. Single-row create form (color swatch + name + Add button). Each label row supports inline rename + recolor + delete (with confirm dialog). Color input uses the browser's native picker for full-gamut access — no preset palette clutter. - `PropRow label="Labels"` added to the issue-detail sidebar below Project Labels are issue metadata everyone uses — not admin configuration. Putting them in Settings next to destructive workspace actions misframed them; adding a top-level nav entry or a sibling tab to the Issues page added surface area that wasn't earning its keep for a feature users touch occasionally. Keeping management in a dialog launched from the picker itself keeps users in their issue context and matches how GitHub handles label editing from the label selector.