feat: unify client messaging into ChatSection + add general comment type

Removed per-task/deliverable CommentList/CommentForm from PhaseTimeline and
ClientKanban. Replaced with a single ChatSection at the bottom of the dashboard
that handles general, task, and deliverable messages in a unified chat UI.
Added "general" entity_type to the comment API (entity_id = client UUID).

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

src/components/client/kanban/PhaseViewToggle.tsx

@@ -3,18 +3,15 @@
 import { useState, type ReactNode } from "react";
 import { ClientKanban } from "./ClientKanban";
 import type { ClientView } from "@/lib/client-view";
-import type { Comment } from "@/db/schema";
 
 export function PhaseViewToggle({
   timelineView,
   phases,
   token,
-  comments,
 }: {
   timelineView: ReactNode;
   phases: ClientView["phases"];
   token: string;
-  comments: Comment[];
 }) {
   const [view, setView] = useState<"timeline" | "kanban">("timeline");
 
@@ -26,9 +23,7 @@ export function PhaseViewToggle({
           <button
             onClick={() => setView("timeline")}
             className={`px-3 py-1.5 rounded-md text-xs font-semibold transition-all ${
-              view === "timeline"
-                ? "bg-white text-[#1A463C] shadow-sm"
-                : "text-[#71717a] hover:text-[#1a1a1a]"
+              view === "timeline" ? "bg-white text-[#1A463C] shadow-sm" : "text-[#71717a] hover:text-[#1a1a1a]"
             }`}
           >
             Timeline
@@ -36,9 +31,7 @@ export function PhaseViewToggle({
           <button
             onClick={() => setView("kanban")}
             className={`px-3 py-1.5 rounded-md text-xs font-semibold transition-all ${
-              view === "kanban"
-                ? "bg-white text-[#1A463C] shadow-sm"
-                : "text-[#71717a] hover:text-[#1a1a1a]"
+              view === "kanban" ? "bg-white text-[#1A463C] shadow-sm" : "text-[#71717a] hover:text-[#1a1a1a]"
             }`}
           >
             Kanban
@@ -46,11 +39,7 @@ export function PhaseViewToggle({
         </div>
       </div>
 
-      {view === "timeline" ? (
-        timelineView
-      ) : (
-        <ClientKanban phases={phases} token={token} comments={comments} />
-      )}
+      {view === "timeline" ? timelineView : <ClientKanban phases={phases} token={token} />}
     </div>
   );
 }