feat(projects): rename, delete, and a trash you can actually reach

A project could be created and shared and never renamed or deleted. Both
have worked through the API since the beginning; there was simply nothing
to click.

The heading is now the field — a heading that happens to be editable
rather than a form that looks like one — and saves on blur, with Escape
putting the old name back. Owner only, and the Inbox keeps its plain
heading because it cannot be either renamed away or deleted.

Deleting needed more than a button. It is soft, with thirty days to
change your mind, and restoring has been possible the whole time — from
an id, which is exactly what you no longer have once the project has gone
from the screen. A recovery window nobody can reach is not one. So
GET /trash/projects lists what you have deleted, with how many tasks went
with it and how long is left, and Settings → Data has the button.

Owned, not shared: a member of a project somebody else deleted has no
business bringing it back, and there is a test that says so.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/api.md

@@ -100,6 +100,8 @@ curl -X POST https://todo.example.dk/api/v1/tasks/quick-add \
 | `POST` | `/projects/{id}/invites` | Share it. `{"email": …, "role": "editor"\|"viewer"}` |
 | `DELETE` | `/projects/{id}/members/{userID}` | |
 | `GET` | `/projects/{id}/activity` | |
+| `GET` | `/trash/projects` | What you have deleted and can still bring back, with how long is left. |
+| `POST` | `/trash/projects/{id}/restore` | Brings it back with the tasks that went with it. |
 
 ### Views, filters and labels
 

docs/openapi.yaml

@@ -785,6 +785,42 @@ paths:
         "204": { description: Deleted. }
         "404": { $ref: "#/components/responses/NotFound" }
 
+  /api/v1/trash/projects:
+    get:
+      tags: [projects]
+      summary: Projects you have deleted and can still bring back.
+      description: |
+        Only your own. Restoring has been possible since the trash existed, but
+        the endpoint takes an id — and the id is what you no longer have once the
+        project has gone from the interface.
+      responses:
+        "200":
+          description: OK
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  projects:
+                    type: array
+                    items:
+                      allOf:
+                        - $ref: "#/components/schemas/Project"
+                        - type: object
+                          properties:
+                            deleted_at: { type: string, format: date-time }
+                            purge_after:
+                              type: string
+                              format: date-time
+                              description: |
+                                When it stops being recoverable. Sent rather than
+                                left for the client to work out, because the
+                                retention window is the server's and a second
+                                copy of it will one day disagree.
+                            task_count:
+                              type: integer
+                              description: Tasks that went with it, and would come back with it.
+
   /api/v1/trash/projects/{projectID}/restore:
     parameters:
       - { name: projectID, in: path, required: true, schema: { type: string } }