FN-7285: add workflow icons and trim built-in labels

Adds workflow icon metadata while preserving readable workflow names without built-in suffixes.

- Store and validate compact plain-text workflow icons across core APIs, imports, exports, tools, and analytics.
- Render Fusion marks for built-in workflows and custom text icons beside existing workflow labels on board, switcher, detail, and editor surfaces.
- Update workflow editor creation/copy flows, docs, release notes, and tests for icon metadata and shorter built-in names.

Files changed:
 .changeset/fn-7285-workflow-icons.md               |   7 ++
 docs/dashboard-guide.md                            |  12 +--
 .../cli/skill/fusion/references/extension-tools.md |   2 +
 .../core/src/__tests__/builtin-workflows.test.ts   |   8 +-
 packages/core/src/__tests__/db-migrate.test.ts     |   7 +-
 .../core/src/__tests__/workflow-analytics.test.ts  |  15 +--
 .../__tests__/workflow-definition-store.test.ts    |  31 ++++++
 packages/core/src/builtin-workflows.ts             |  20 ++--
 packages/core/src/db.ts                            |  11 +-
 packages/core/src/index.ts                         |   4 +
 packages/core/src/store.ts                         |  24 ++++-
 packages/core/src/workflow-analytics.ts            |   7 +-
 packages/core/src/workflow-definition-types.ts     |  31 ++++++
 packages/dashboard/app/api/legacy.ts               |   2 +
 packages/dashboard/app/components/Board.tsx        |  18 ++--
 packages/dashboard/app/components/Column.tsx       |   2 +-
 packages/dashboard/app/components/TaskCard.tsx     |   7 +-
 .../dashboard/app/components/TaskDetailModal.tsx   |  20 ++--
 packages/dashboard/app/components/WorkflowIcon.css |  42 ++++++++
 packages/dashboard/app/components/WorkflowIcon.tsx |  49 +++++++++
 .../app/components/WorkflowNodeEditor.css          |  32 ++++++
 .../app/components/WorkflowNodeEditor.tsx          | 113 ++++++++++++++++-----
 .../dashboard/app/components/WorkflowSwitcher.css  |   9 ++
 .../dashboard/app/components/WorkflowSwitcher.tsx  |  15 ++-
 .../dashboard/app/components/WorktreeGroup.tsx     |   2 +-
 .../app/components/__tests__/Board.test.tsx        |  12 +--
 .../app/components/__tests__/Lane.test.tsx         |   6 +-
 .../__tests__/WorkflowNodeEditor.test.tsx          |  57 +++++++++--
 .../components/__tests__/WorkflowSwitcher.test.tsx |  68 ++++++++-----
 .../__tests__/board-mobile-initial-render.test.tsx |   2 +-
 .../__tests__/CommandCenter.test.tsx               |   4 +-
 .../command-center/areas/WorkflowArea.tsx          |   2 +
 .../areas/__tests__/WorkflowArea.test.tsx          |   6 +-
 .../settings/sections/GeneralSection.tsx           |   6 +-
 .../register-command-center-routes.test.ts         |   2 +-
 .../__tests__/workflow-import-export.test.ts       |  32 +++++-
 packages/dashboard/src/routes/board-workflows.ts   |   6 +-
 .../src/routes/register-workflow-routes.ts         |  32 +++++-
 packages/engine/src/__tests__/agent-tools.test.ts  |   4 +-
 packages/engine/src/agent-tools.ts                 |   6 +-
 40 files changed, 590 insertions(+), 145 deletions(-)

Fusion-Task-Id: FN-7285
Fusion-Task-Lineage: 0fa689a2-f19d-4d1b-9a40-cc0b2181200a
Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

packages/dashboard/app/api/legacy.ts

@@ -630,6 +630,8 @@ export type { WorkflowSettingDefinition, WorkflowSettingType, WorkflowSettingOpt
 export interface BoardWorkflowDefinition {
   id: string;
   name: string;
+  /** Optional compact custom workflow icon; built-ins render the Fusion mark by id. */
+  icon?: string;
   columns: BoardWorkflowColumn[];
   /** Custom field definitions declared by this workflow (U13/KTD-14). Absent on
    *  workflows with no fields, or from older servers. */