🐛 Guard workspace-page* when file-id is not a uuid (#10655)

The workspace route can be reached without a `:file-id` query parameter
(e.g. `/#/workspace?team-id=...`). When that happened, `workspace*` was
emitting `dw/initialize-workspace` with a nil file-id, which stored nil
in `:current-file-id`. The `fetch-profiles` event then read nil from
state and called `:get-profiles-for-file-comments` with `{:file-id
nil}`, producing a 400 response.

Move the `use-equal-memo` calls for `file-id` and `page-id` from
`workspace*` up to `workspace-page*`, and guard the render with
`(when (uuid? file-id) ...)` so `workspace*` only mounts when `file-id`
is a valid uuid. Since `workspace*` never mounts with a nil `file-id`,
`initialize-workspace` is never emitted with nil, and the 400 is
prevented at the source.

AI-assisted-by: minimax-m3

frontend/src/app/main/ui/workspace.cljs

@@ -196,10 +196,7 @@
   {::mf/wrap [mf/memo]}
   [{:keys [team-id project-id file-id page-id layout-name]}]
 
-  (let [file-id          (hooks/use-equal-memo file-id)
-        page-id          (hooks/use-equal-memo page-id)
-
-        layout           (mf/deref refs/workspace-layout)
+  (let [layout           (mf/deref refs/workspace-layout)
         wglobal          (mf/deref refs/workspace-global)
 
         team-ref         (mf/with-memo [team-id]
@@ -287,6 +284,12 @@
 
 (mf/defc workspace-page*
   {::mf/lazy-load true}
-  [props]
-  [:> workspace* props])
+  [{:keys [file-id page-id] :as props}]
+  (let [file-id (hooks/use-equal-memo file-id)
+        page-id (hooks/use-equal-memo page-id)
+        props   (mf/spread-props props {:file-id file-id
+                                        :page-id page-id})]
+
+    (when (uuid? file-id)
+      [:> workspace* props])))