fix: lighten session list payloads (#1538)

* lighten session list

* fetch full session on open

* sanitize session list

* sanitize global sessions

* preserve revert markers in session lists

* fix: preserve session metadata in list sanitizers

---------

Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/ui/src/sync/use-sync.test.ts

@@ -0,0 +1,29 @@
+import { describe, expect, test } from 'bun:test'
+
+import { shouldFetchSessionForRenderableSync } from './use-sync'
+
+describe('shouldFetchSessionForRenderableSync', () => {
+  test('fetches full session detail when a lightweight list session is opened', () => {
+    expect(shouldFetchSessionForRenderableSync({
+      hasSession: true,
+      shouldLoadMessages: true,
+      force: false,
+    })).toBe(true)
+  })
+
+  test('skips session detail fetch when session and messages are already ready', () => {
+    expect(shouldFetchSessionForRenderableSync({
+      hasSession: true,
+      shouldLoadMessages: false,
+      force: false,
+    })).toBe(false)
+  })
+
+  test('fetches when the session record is missing', () => {
+    expect(shouldFetchSessionForRenderableSync({
+      hasSession: false,
+      shouldLoadMessages: false,
+      force: false,
+    })).toBe(true)
+  })
+})