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/vitest.setup.ts

@@ -49,20 +49,9 @@ if (typeof globalThis.cancelAnimationFrame !== "function") {
   };
 }
 
-vi.mock("react-native-unistyles", () => ({
-  StyleSheet: {
-    create: <T>(styles: T) => styles,
-  },
-  useUnistyles: () => ({
-    theme: {},
-    rt: {},
-    breakpoint: undefined,
-  }),
-  UnistylesRuntime: {
-    setTheme: vi.fn(),
-    themeName: "light",
-  },
-}));
+// The unistyles test double lives in test-stubs/react-native-unistyles.ts and
+// reaches every vitest project through the resolve.alias in vitest.config.ts —
+// no vi.mock here, so there is a single copy of the fixture theme.
 
 vi.mock("@xterm/addon-ligatures", () => ({
   LigaturesAddon: class LigaturesAddon {
@@ -70,31 +59,9 @@ vi.mock("@xterm/addon-ligatures", () => ({
   },
 }));
 
-vi.mock("react-native-svg", () => {
-  const Stub = () => null;
-  return {
-    __esModule: true,
-    default: Stub,
-    Circle: Stub,
-    Defs: Stub,
-    G: Stub,
-    Line: Stub,
-    LinearGradient: Stub,
-    Path: Stub,
-    Rect: Stub,
-    Stop: Stub,
-    SvgCss: Stub,
-    SvgCssUri: Stub,
-    SvgFromXml: Stub,
-    SvgUri: Stub,
-    SvgXml: Stub,
-    Use: Stub,
-  };
-});
-
-vi.mock("expo-linking", () => ({
-  openURL: vi.fn().mockResolvedValue(undefined),
-}));
+// react-native-svg and expo-linking test doubles live in test-stubs/ and reach
+// every vitest project through the resolve.alias in vitest.config.ts, same as
+// react-native-unistyles and lucide-react-native.
 
 const RouterPassthrough = ({ children }: { children?: React.ReactNode }) => children;