feat(forge): pluggable forge abstraction + GitLab and Gitea/Forgejo/Codeberg (#1913)

* refactor(forge): forge-neutral foundation (GitHub-only)

Decouple git-hosting from GitHub behind a neutral abstraction (issue #1616), GitHub-only for now; existing GitHub behaviour is unchanged.

- Forge manifest, neutral ForgeService contract, forge registry + resolver, and a client forge-module registry.
- GitHub code renamed to the neutral shape; PR/Issue attachment wording preserved.
- forge.search.response enums parse tolerantly (unknown kind/auth state degrade instead of breaking the client).
- createPullRequest reports typed CLI/auth errors instead of a generic message.
- forge-resolver host/remote caches are LRU-bounded.
- Forge host trust is explicit: only a known cloud host or a CLI-authenticated host is ever talked to; an unauthenticated GitHub Enterprise host fails resolution instead of routing to github.com.
- Docs: forge-providers guide, glossary and i18n forge-copy conventions, architecture and rpc-namespacing terminology.
- Vitest React Native mocks (unistyles, svg, linking, lucide) consolidated into shared aliased test-stubs.

* feat(forge): GitLab adapter, forge-aware UI, pipelines and approvals

GitLab adapter over the glab CLI on the neutral contracts: MR status, forge-aware UI, pipeline tree, and N-of-M approvals.

- threadIsResolved is part of the neutral timeline item.
- Pipeline load failures show an error instead of an empty section.
- Manual pipeline jobs render as pending.
- Fork/detached MR head pipelines are fetched by MR iid (glab ci get --merge-request).

* feat(forge): Gitea family adapter (Gitea, Forgejo, Codeberg)

One adapter over the tea CLI serving Gitea, Forgejo, and Codeberg on the neutral contracts.

- CI status aggregates commit statuses and Actions runs together.
- Gitea's terminal "warning" state maps to failure on server and client.
- Gitea Actions check details are reachable from the PR pane by workflowRunId.

* refactor(forge): localize compatibility handling

* test(forge): expect normalized GitLab facts

---------

Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

packages/app/src/git/checkout-status-cache.ts

@@ -6,10 +6,11 @@ import {
   checkoutStatusQueryKey,
   invalidatePrPaneTimelineForCheckout,
 } from "@/git/query-keys";
+import { type CheckoutPrStatusPayload, normalizeCheckoutPrStatusPayload } from "@/git/pr-status";
 import { expireStaleDiffModeOverrides } from "@/review/store";
 
 export type CheckoutStatusPayload = CheckoutStatusResponse["payload"];
-export type CheckoutPrStatusPayload = NonNullable<CheckoutStatusUpdate["payload"]["prStatus"]>;
+export type { CheckoutPrStatusPayload } from "@/git/pr-status";
 
 export interface CheckoutStatusClient {
   getCheckoutStatus: (cwd: string) => Promise<CheckoutStatusPayload>;
@@ -43,14 +44,17 @@ export function applyCheckoutStatusUpdateFromEvent({
   message: CheckoutStatusUpdate;
 }): void {
   const { payload } = message;
-  queryClient.setQueryData(checkoutStatusQueryKey(serverId, payload.cwd), payload);
+  const prStatus = payload.prStatus
+    ? normalizeCheckoutPrStatusPayload(payload.prStatus)
+    : undefined;
+  const cachePayload = prStatus ? { ...payload, prStatus } : payload;
+  queryClient.setQueryData(checkoutStatusQueryKey(serverId, payload.cwd), cachePayload);
   expireStaleDiffModeOverrides({
     serverId,
     cwd: payload.cwd,
     isDirty: payload.isGit && payload.isDirty,
   });
 
-  const prStatus = payload.prStatus;
   if (!prStatus) {
     return;
   }