Finish the mobile performance pass

- Cache the model catalog once per user and each conversation's setting
  separately; clear both on logout and after model saves
- Compress hashed assets asynchronously with a byte budget and set Vary
- Memoize message parsing and throttle selection reads
- Debounce draft writes to localStorage
- Keep the composer editor on the page and focused, as before
- Add a bundle budget check and run it in CI
- Show a loading block while sessions load and a workspace avatar in the
  mobile conversation header

src/pages/admin/bots/[bot_id]/(functions)/fetch-harness-catalog.ts

@@ -0,0 +1,17 @@
+import fetchApi from "@moduletrace/twui/utils/fetch/fetchApi";
+import type { APIResponseObject } from "@moduletrace/bunext/types";
+import type { HarnessCatalogPayload } from "@/src/types";
+
+/**
+ * The install-wide models catalog, shared by every conversation's models
+ * modal and cached once per user.
+ */
+export default async function fetchHarnessCatalog() {
+    return await fetchApi<
+        Record<string, never>,
+        APIResponseObject<HarnessCatalogPayload>
+    >(`/api/admin/harness/catalog`, {
+        method: "POST",
+        body: {},
+    });
+}

src/pages/admin/bots/[bot_id]/(functions)/fetch-harness-overview.ts

@@ -1,16 +1,16 @@
 import fetchApi from "@moduletrace/twui/utils/fetch/fetchApi";
 import type { APIResponseObject } from "@moduletrace/bunext/types";
 import type { BotConversationRequest } from "@/src/schemas/bot-schema";
-import type { BotHarnessOverviewPayload } from "@/src/types";
+import type { BotHarnessSettingsPayload } from "@/src/types";
 
 /**
- * What a conversation's models modal edits: per harness, the setting, the
- * models it can pick and what it runs on now.
+ * What a conversation's models form edits, without the install-wide
+ * catalog: the setting, what runs now, and what the default runs on.
  */
 export default async function fetchHarnessOverview({ bot_id, workspace_id }: BotConversationRequest) {
     return await fetchApi<
         BotConversationRequest,
-        APIResponseObject<BotHarnessOverviewPayload>
+        APIResponseObject<BotHarnessSettingsPayload>
     >(`/api/admin/bots/harness-overview`, {
         method: "POST",
         body: { bot_id, workspace_id },