Require accepting ToS when enabling zeta (#23255)

Note: Design hasn't been reviewed yet, but the logic is done

When the user switches the inline completion provider to `zed`, we'll
show a modal prompting them to accept terms if they haven't done so:


https://github.com/user-attachments/assets/3fc6d368-c00a-4dcb-9484-fbbbb5eb859e

If they dismiss the modal, they'll be able to get to it again from the
inline completion button:


https://github.com/user-attachments/assets/cf842778-5538-4e06-9ed8-21579981cc47

This also stops zeta sending requests that will fail immediately when
ToS are not accepted.

Release Notes:

- N/A

---------

Co-authored-by: Richard <richard@zed.dev>
Co-authored-by: Danilo Leal <daniloleal09@gmail.com>
Co-authored-by: Joao <joao@zed.dev>

crates/editor/src/editor.rs

@@ -70,6 +70,7 @@ pub use element::{
 };
 use futures::{future, FutureExt};
 use fuzzy::StringMatchCandidate;
+use zed_predict_tos::ZedPredictTos;
 
 use code_context_menus::{
     AvailableCodeAction, CodeActionContents, CodeActionsItem, CodeActionsMenu, CodeContextMenu,
@@ -459,6 +460,7 @@ type CompletionId = usize;
 enum InlineCompletionMenuHint {
     Loading,
     Loaded { text: InlineCompletionText },
+    PendingTermsAcceptance,
     None,
 }
 
@@ -468,6 +470,7 @@ impl InlineCompletionMenuHint {
             InlineCompletionMenuHint::Loading | InlineCompletionMenuHint::Loaded { .. } => {
                 "Edit Prediction"
             }
+            InlineCompletionMenuHint::PendingTermsAcceptance => "Accept Terms of Service",
             InlineCompletionMenuHint::None => "No Prediction",
         }
     }
@@ -3828,6 +3831,14 @@ impl Editor {
         self.do_completion(action.item_ix, CompletionIntent::Compose, cx)
     }
 
+    fn toggle_zed_predict_tos(&mut self, cx: &mut ViewContext<Self>) {
+        let (Some(workspace), Some(project)) = (self.workspace(), self.project.as_ref()) else {
+            return;
+        };
+
+        ZedPredictTos::toggle(workspace, project.read(cx).user_store().clone(), cx);
+    }
+
     fn do_completion(
         &mut self,
         item_ix: Option<usize>,
@@ -3851,6 +3862,14 @@ impl Editor {
                         self.context_menu_next(&Default::default(), cx);
                         return Some(Task::ready(Ok(())));
                     }
+                    Some(CompletionEntry::InlineCompletionHint(
+                        InlineCompletionMenuHint::PendingTermsAcceptance,
+                    )) => {
+                        drop(entries);
+                        drop(context_menu);
+                        self.toggle_zed_predict_tos(cx);
+                        return Some(Task::ready(Ok(())));
+                    }
                     _ => {}
                 }
             }
@@ -4974,6 +4993,8 @@ impl Editor {
             Some(InlineCompletionMenuHint::Loaded { text })
         } else if provider.is_refreshing(cx) {
             Some(InlineCompletionMenuHint::Loading)
+        } else if provider.needs_terms_acceptance(cx) {
+            Some(InlineCompletionMenuHint::PendingTermsAcceptance)
         } else {
             Some(InlineCompletionMenuHint::None)
         }