Add Programmer Tasks module (work-log + time tracking)

Separate feature for the `programmer` role to record dev work by category,
distinct from the IT help-desk `tasks` feature. Modeled on the IT Service
Requests pattern (Brick offline-first model -> Riverpod stream/controller ->
list/detail screens); seed of a future Project Management workflow.

- programmer_tasks + programmer_task_activity_logs (category enum, RLS,
  realtime) via supabase migration
- single assignee, self-logged or lead-assigned; assign/reassign logged
- pause-on-switch: starting a task while another runs prompts to pause the
  running one, keeping one active task per user for accurate time attribution
- worked-duration math shared with help-desk tasks via a generic core in
  task_duration.dart (existing callers unchanged)
- list distinguishes running vs paused with a per-task Resume shortcut
- accessible dialog labels; route /programmer-tasks + nav gated to admin/programmer
- unit/widget tests: controller lifecycle, duration math, pause-switch dialog

Co-Authored-By: claude-flow <ruv@ruv.net>

lib/brick/db/20260926162926.migration.dart

@@ -0,0 +1,80 @@
+// GENERATED CODE EDIT WITH CAUTION
+// THIS FILE **WILL NOT** BE REGENERATED
+// This file should be version controlled and can be manually edited.
+part of 'schema.g.dart';
+
+// While migrations are intelligently created, the difference between some commands, such as
+// DropTable vs. RenameTable, cannot be determined. For this reason, please review migrations after
+// they are created to ensure the correct inference was made.
+
+// The migration version must **always** mirror the file name
+
+const List<MigrationCommand> _migration_20260926162926_up = [
+  InsertTable('ProgrammerTask'),
+  InsertTable('ProgrammerTaskActivityLog'),
+  InsertColumn('id', Column.varchar, onTable: 'ProgrammerTask'),
+  InsertColumn('title', Column.varchar, onTable: 'ProgrammerTask'),
+  InsertColumn('description', Column.varchar, onTable: 'ProgrammerTask'),
+  InsertColumn('category', Column.varchar, onTable: 'ProgrammerTask'),
+  InsertColumn('status', Column.varchar, onTable: 'ProgrammerTask'),
+  InsertColumn('priority', Column.integer, onTable: 'ProgrammerTask'),
+  InsertColumn('assignee_id', Column.varchar, onTable: 'ProgrammerTask'),
+  InsertColumn('creator_id', Column.varchar, onTable: 'ProgrammerTask'),
+  InsertColumn('created_at', Column.datetime, onTable: 'ProgrammerTask'),
+  InsertColumn('started_at', Column.datetime, onTable: 'ProgrammerTask'),
+  InsertColumn('completed_at', Column.datetime, onTable: 'ProgrammerTask'),
+  InsertColumn('cancelled_at', Column.datetime, onTable: 'ProgrammerTask'),
+  InsertColumn('cancellation_reason', Column.varchar, onTable: 'ProgrammerTask'),
+  InsertColumn('updated_at', Column.datetime, onTable: 'ProgrammerTask'),
+  InsertColumn('is_terminal', Column.boolean, onTable: 'ProgrammerTask'),
+  InsertColumn('id', Column.varchar, onTable: 'ProgrammerTaskActivityLog'),
+  InsertColumn('task_id', Column.varchar, onTable: 'ProgrammerTaskActivityLog'),
+  InsertColumn('actor_id', Column.varchar, onTable: 'ProgrammerTaskActivityLog'),
+  InsertColumn('action_type', Column.varchar, onTable: 'ProgrammerTaskActivityLog'),
+  InsertColumn('meta', Column.varchar, onTable: 'ProgrammerTaskActivityLog'),
+  InsertColumn('created_at', Column.datetime, onTable: 'ProgrammerTaskActivityLog')
+];
+
+const List<MigrationCommand> _migration_20260926162926_down = [
+  DropTable('ProgrammerTask'),
+  DropTable('ProgrammerTaskActivityLog'),
+  DropColumn('id', onTable: 'ProgrammerTask'),
+  DropColumn('title', onTable: 'ProgrammerTask'),
+  DropColumn('description', onTable: 'ProgrammerTask'),
+  DropColumn('category', onTable: 'ProgrammerTask'),
+  DropColumn('status', onTable: 'ProgrammerTask'),
+  DropColumn('priority', onTable: 'ProgrammerTask'),
+  DropColumn('assignee_id', onTable: 'ProgrammerTask'),
+  DropColumn('creator_id', onTable: 'ProgrammerTask'),
+  DropColumn('created_at', onTable: 'ProgrammerTask'),
+  DropColumn('started_at', onTable: 'ProgrammerTask'),
+  DropColumn('completed_at', onTable: 'ProgrammerTask'),
+  DropColumn('cancelled_at', onTable: 'ProgrammerTask'),
+  DropColumn('cancellation_reason', onTable: 'ProgrammerTask'),
+  DropColumn('updated_at', onTable: 'ProgrammerTask'),
+  DropColumn('is_terminal', onTable: 'ProgrammerTask'),
+  DropColumn('id', onTable: 'ProgrammerTaskActivityLog'),
+  DropColumn('task_id', onTable: 'ProgrammerTaskActivityLog'),
+  DropColumn('actor_id', onTable: 'ProgrammerTaskActivityLog'),
+  DropColumn('action_type', onTable: 'ProgrammerTaskActivityLog'),
+  DropColumn('meta', onTable: 'ProgrammerTaskActivityLog'),
+  DropColumn('created_at', onTable: 'ProgrammerTaskActivityLog')
+];
+
+//
+// DO NOT EDIT BELOW THIS LINE
+//
+
+@Migratable(
+  version: '20260926162926',
+  up: _migration_20260926162926_up,
+  down: _migration_20260926162926_down,
+)
+class Migration20260926162926 extends Migration {
+  const Migration20260926162926()
+    : super(
+        version: 20260926162926,
+        up: _migration_20260926162926_up,
+        down: _migration_20260926162926_down,
+      );
+}