Improve Mesh Tab: Organize by contract with status filter (#5)

* Add status filter toggle to Mesh Tab TaskList component

Add a filter toggle at the top of the TaskList that allows filtering by
contract status (All, Active, Completed, Archive) with Active as the default.

Changes:
- Backend: Add contract_status field to TaskSummary struct in models.rs
- Backend: Update all SQL queries returning TaskSummary to include
  c.status as contract_status from the contracts table join
- Frontend: Add contractStatus to TaskSummary TypeScript type
- Frontend: Add useState for statusFilter with 'active' as default
- Frontend: Add filter button group in header area next to '+ New Task'
- Frontend: Update groupedTasks useMemo to filter based on contract status
- Frontend: Update empty state message to reflect current filter

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Task completion checkpoint

* feat(mesh): show all contract tasks for supervisor tasks

When viewing a supervisor task (task.isSupervisor === true), the
TaskDetail component now shows all tasks in the contract instead
of showing the subtasks tree.

Changes:
- Add contractTasks prop to TaskDetailProps for passing contract tasks
- Add displayTasks computed value that uses contractTasks for supervisors
- Change section header from "Subtasks" to "Contract Tasks" for supervisors
- Hide the "+ Add Subtask" button for supervisor tasks
- Update empty state message for supervisors
- Fetch contract tasks in mesh.tsx when viewing a supervisor task
- Filter out the supervisor itself from the contract tasks list

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Task completion checkpoint

* Task completion checkpoint

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/makima/src/db/models.rs b/makima/src/db/models.rs
index 99c8b8e..3e6997f 100644
--- a/makima/src/db/models.rs
+++ b/makima/src/db/models.rs
@@ -544,6 +544,8 @@ pub struct TaskSummary {
     pub contract_name: Option<String>,
     /// Contract phase (joined from contracts table)
     pub contract_phase: Option<String>,
+    /// Contract status (joined from contracts table): 'active', 'completed', 'archived'
+    pub contract_status: Option<String>,
     pub parent_task_id: Option<Uuid>,
     /// Depth in task hierarchy: 0=orchestrator (top-level), 1=subtask (max)
     pub depth: i32,
@@ -568,6 +570,7 @@ impl From<Task> for TaskSummary {
             contract_id: task.contract_id,
             contract_name: None, // Not available from Task directly
             contract_phase: None, // Not available from Task directly
+            contract_status: None, // Not available from Task directly
             parent_task_id: task.parent_task_id,
             depth: task.depth,
             name: task.name,