fix(issues): guard missing companyId and enrich activity log context

Add 400 response for /issues without companyId, tag issue.updated
activity with source:comment when triggered by a comment, and mark
comment activities with updated:true when field changes accompany them.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/routes/issues.ts

@@ -184,6 +184,13 @@ export function issueRoutes(db: Db, storage: StorageService) {
     }
   });
 
+  // Common malformed path when companyId is empty in "/api/companies/{companyId}/issues".
+  router.get("/issues", (_req, res) => {
+    res.status(400).json({
+      error: "Missing companyId in path. Use /api/companies/{companyId}/issues.",
+    });
+  });
+
   router.get("/companies/:companyId/issues", async (req, res) => {
     const companyId = req.params.companyId as string;
     assertCompanyAccess(req, companyId);
@@ -522,6 +529,7 @@ export function issueRoutes(db: Db, storage: StorageService) {
     }
 
     const actor = getActorInfo(req);
+    const hasFieldChanges = Object.keys(previous).length > 0;
     await logActivity(db, {
       companyId: issue.companyId,
       actorType: actor.actorType,
@@ -531,7 +539,12 @@ export function issueRoutes(db: Db, storage: StorageService) {
       action: "issue.updated",
       entityType: "issue",
       entityId: issue.id,
-      details: { ...updateFields, identifier: issue.identifier, _previous: Object.keys(previous).length > 0 ? previous : undefined },
+      details: {
+        ...updateFields,
+        identifier: issue.identifier,
+        ...(commentBody ? { source: "comment" } : {}),
+        _previous: hasFieldChanges ? previous : undefined,
+      },
     });
 
     let comment = null;
@@ -555,6 +568,7 @@ export function issueRoutes(db: Db, storage: StorageService) {
           bodySnippet: comment.body.slice(0, 120),
           identifier: issue.identifier,
           issueTitle: issue.title,
+          ...(hasFieldChanges ? { updated: true } : {}),
         },
       });