Add our first view via Next.js for Agents (#817)

Initialize our migration to use Next.js for front-end views via Agents. This includes setup for getting authenticated users, reading in available agents, setting up a pop-up modal when you're clicking on an agent, and allowing users to start new conversations with agents.

Best attempt at an in-place migration, though there are some noticeable differences.

Also adds view for chat that are not being used, but in experimental phase.

src/interface/web/app/chat/chat.module.css

@@ -0,0 +1,86 @@
+div.main {
+    height: 100vh;
+    color: black;
+}
+
+.suggestions {
+    display: grid;
+    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
+    gap: 1rem;
+    justify-content: center;
+}
+
+div.inputBox {
+    display: grid;
+    grid-template-columns: 1fr auto;
+    padding: 1rem;
+    border-radius: 1rem;
+    background-color: #f5f5f5;
+    box-shadow: 0 0 1rem 0 rgba(0, 0, 0, 0.1);
+}
+
+input.inputBox {
+    border: none;
+    outline: none;
+    background-color: transparent;
+}
+
+input.inputBox:focus {
+    border: none;
+    outline: none;
+    background-color: transparent;
+}
+
+div.chatBodyFull {
+    display: grid;
+    grid-template-columns: 1fr;
+    height: 100%;
+}
+
+button.inputBox {
+    border: none;
+    outline: none;
+    background-color: transparent;
+    cursor: pointer;
+    border-radius: 0.5rem;
+    padding: 0.5rem;
+    background: linear-gradient(var(--calm-green), var(--calm-blue));
+}
+
+div.chatBody {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    height: 100%;
+}
+
+.inputBox {
+    color: black;
+}
+
+div.chatLayout {
+    display: grid;
+    grid-template-columns: auto 1fr;
+    gap: 1rem;
+}
+
+div.chatBox {
+    display: grid;
+    gap: 1rem;
+    height: 100%;
+    padding: 1rem;
+}
+
+div.titleBar {
+    display: grid;
+    grid-template-columns: 1fr auto;
+}
+
+@media (max-width: 768px) {
+    div.chatBody {
+        grid-template-columns: 0fr 1fr;
+    }
+
+    div.chatBox {
+        padding: 0;
+    }
+}