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/pr-hint.ts

@@ -1,7 +1,11 @@
+import { normalizeForge, type Forge } from "@/git/forge";
+
 export interface PrHint {
   url: string;
   number: number;
   state: "open" | "merged" | "closed";
+  /** Forge backing this change request, so badges render the right brand mark. */
+  forge: Forge;
   checks?: Array<{ name: string; status: string; url: string | null }>;
   checksStatus?: "none" | "pending" | "success" | "failure";
   reviewDecision?: "approved" | "changes_requested" | "pending" | null;
@@ -14,12 +18,15 @@ interface PrStatusLike {
   checks?: Array<{ name: string; status: string; url: string | null }>;
   checksStatus?: string;
   reviewDecision?: string | null;
+  forge?: string;
 }
 
 function parsePullRequestNumber(url: string): number | null {
   try {
     const pathname = new URL(url).pathname;
-    const match = pathname.match(/\/pull\/(\d+)(?:\/|$)/);
+    // GitHub uses /pull/N, Gitea/Forgejo /pulls/N, GitLab /-/merge_requests/N.
+    // Match any so a non-GitHub change-request summary yields a hint (and brand mark).
+    const match = pathname.match(/\/(?:pull|pulls|merge_requests)\/(\d+)(?:\/|$)/);
     if (!match) {
       return null;
     }
@@ -31,7 +38,10 @@ function parsePullRequestNumber(url: string): number | null {
   }
 }
 
-export function selectPrHintFromStatus(status: PrStatusLike | null | undefined): PrHint | null {
+export function selectPrHintFromStatus(
+  status: PrStatusLike | null | undefined,
+  forge?: string | null,
+): PrHint | null {
   if (!status?.url) {
     return null;
   }
@@ -50,6 +60,7 @@ export function selectPrHintFromStatus(status: PrStatusLike | null | undefined):
     url: status.url,
     number,
     state,
+    forge: normalizeForge(forge ?? status.forge),
     checks: status.checks,
     checksStatus: status.checksStatus as PrHint["checksStatus"],
     reviewDecision: status.reviewDecision as PrHint["reviewDecision"],