feat: tickets I follow, and more news for followers

"Que sigo" on the home page lists the open tickets I follow, whoever
works on them; `watching` filters my issues (REST, GraphQL, MCP) and a
project's search (none without a session).

Followers now also hear when a ticket's priority or due date changes,
and when it enters or leaves a sprint. Smaller edits (title, labels…)
still do not notify.

Docs (with the REPLIED row the replies change missed), Word and PDF
updated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/api/openapi.json

@@ -2018,6 +2018,15 @@
               "type": "boolean"
             }
           },
+          {
+            "name": "watching",
+            "required": false,
+            "in": "query",
+            "description": "Only the tickets I follow (with assignedToMe=false, whoever they are assigned to)",
+            "schema": {
+              "type": "boolean"
+            }
+          },
           {
             "name": "status",
             "required": false,
@@ -2278,6 +2287,15 @@
               "type": "boolean"
             }
           },
+          {
+            "name": "watching",
+            "required": false,
+            "in": "query",
+            "description": "Only the tickets I follow (none without a token)",
+            "schema": {
+              "type": "boolean"
+            }
+          },
           {
             "name": "dueFrom",
             "required": false,

apps/api/schema.gql

@@ -508,6 +508,9 @@ input IssueFilterInput {
   statuses: [String!]
   types: [String!]
   unassigned: Boolean
+
+  """Only the tickets I follow (none when anonymous)"""
+  watching: Boolean
 }
 
 type IssueLink {
@@ -960,6 +963,9 @@ type Query {
     """Matches key, title or description (global search)"""
     search: String
     statuses: [String!]
+
+    """Only the tickets I follow"""
+    watching: Boolean! = false
   ): IssuePage!
 
   """My notifications, newest first, and how many are unread"""