demo(app-showcase): bulk multi-select edit on the Project grid (#2185)

Exercises the objectui BulkActionDialog multi-select fix
(objectstack-ai/objectui#2186) end-to-end in a real running app:

- project.object.ts: add `labels` (multiselect, fixed options) and
  `team_members` (multi-user) — the two shapes the bulk dialog could not
  set before #2185 (its picker collapsed to a single value / overwrote
  the array).
- project.view.ts: add the two columns and three `bulkActionDefs`:
  • set_labels  → multi-select on a `select` param (array patch)
  • assign_team → multi-select on a `lookup` param (sys_user)
  • reschedule  → the new `date` control + a single-select

Verified in objectstack dev: select rows → each action writes an array
(or date) patch to all selected records; labels/team_members/end_date
persist server-side.

Author: baozhoutao

examples/app-showcase/src/objects/project.object.ts

@@ -56,6 +56,24 @@ export const Project = ObjectSchema.create({
     start_date: Field.date({ label: 'Start Date' }),
     end_date: Field.date({ label: 'Target End Date' }),
     owner: Field.text({ label: 'Owner', maxLength: 200 }),
+    // Multi-value fields — the payload for the grid's *bulk-edit* showcase. A
+    // multiselect (fixed options) and a multi-user field are exactly the two
+    // shapes that, before #2185, the bulk dialog could not set: its people /
+    // select picker collapsed to a single value and overwrote the array. The
+    // list view's `bulkActionDefs` below now sets both with real multi-select
+    // controls, writing an array patch.
+    labels: {
+      type: 'multiselect',
+      label: 'Labels',
+      options: [
+        { label: 'Frontend', value: 'frontend', color: '#3B82F6' },
+        { label: 'Backend', value: 'backend', color: '#8B5CF6' },
+        { label: 'Design', value: 'design', color: '#EC4899' },
+        { label: 'QA', value: 'qa', color: '#F59E0B' },
+        { label: 'DevOps', value: 'devops', color: '#10B981' },
+      ],
+    },
+    team_members: Field.user({ label: 'Team Members', multiple: true }),
     // Roll-up summaries — recomputed server-side whenever a child task is
     // inserted / updated / deleted (FK auto-detected: showcase_task.project).
     task_count: Field.summary({

examples/app-showcase/src/views/project.view.ts

@@ -15,10 +15,81 @@ export const ProjectViews = defineView({
       { field: 'account' },
       { field: 'status' },
       { field: 'health' },
+      { field: 'labels' },
+      { field: 'team_members' },
       { field: 'budget' },
       { field: 'budget_remaining' },
       { field: 'end_date' },
     ],
+    // Rich bulk-edit definitions (#2185) — select rows, then "set the same
+    // value on all of them" through the BulkActionDialog. Each def exercises a
+    // control the dialog gained in #2185:
+    //   • set_labels    → multi-select on a `select` param (fixed options)
+    //   • assign_team   → multi-select on a `lookup` param (users; array patch)
+    //   • reschedule    → the new `date` control + a single-select together
+    // A def with no `multiple` still renders a single-select, unchanged.
+    bulkActionDefs: [
+      {
+        name: 'set_labels',
+        label: 'Set Labels',
+        operation: 'update',
+        confirmText: 'Set these labels on every selected project?',
+        params: [
+          {
+            name: 'labels',
+            label: 'Labels',
+            type: 'select',
+            multiple: true,
+            required: true,
+            options: [
+              { label: 'Frontend', value: 'frontend' },
+              { label: 'Backend', value: 'backend' },
+              { label: 'Design', value: 'design' },
+              { label: 'QA', value: 'qa' },
+              { label: 'DevOps', value: 'devops' },
+            ],
+          },
+        ],
+      },
+      {
+        name: 'assign_team',
+        label: 'Assign Team',
+        operation: 'update',
+        confirmText: 'Assign these team members to every selected project?',
+        params: [
+          {
+            name: 'team_members',
+            label: 'Team Members',
+            type: 'lookup',
+            object: 'sys_user',
+            multiple: true,
+            labelField: 'name',
+            required: true,
+          },
+        ],
+      },
+      {
+        name: 'reschedule',
+        label: 'Reschedule',
+        operation: 'update',
+        confirmText: 'Apply this schedule/status to every selected project?',
+        params: [
+          { name: 'end_date', label: 'Target End Date', type: 'date' },
+          {
+            name: 'status',
+            label: 'Status',
+            type: 'select',
+            options: [
+              { label: 'Planned', value: 'planned' },
+              { label: 'Active', value: 'active' },
+              { label: 'On Hold', value: 'on_hold' },
+              { label: 'Completed', value: 'completed' },
+              { label: 'Cancelled', value: 'cancelled' },
+            ],
+          },
+        ],
+      },
+    ],
   },
   listViews: {
     by_status: {