fix(apiproxy): title-invalid only for the input's fault, presentable messages

The rename impl narrows on SessionTitleInvalidError: only an
empty-normalizing title maps to title-invalid (its message renders verbatim
in the rename dialog alert), while liveness/disposal races fall to internal;
the absent-service message trims to one presentable sentence. rpc-schemas
gains the title-invalid accept/missing-details lines; cosmetic ordering
(type-only import comment, tsconfig reference, schema import order) restored.

packages/host/apiproxy/src/fetch/client.ts

@@ -20,11 +20,11 @@ import {
 import {
   sessionCancelValueSchema,
   sessionCreateValueSchema,
-  sessionRenameValueSchema,
   sessionHistoryValueSchema,
   sessionListValueSchema,
   sessionModelsValueSchema,
   sessionPromptValueSchema,
+  sessionRenameValueSchema,
   sessionSelectModelValueSchema,
 } from '../api/sessions.schema.ts'
 import {