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/workspace-actions.tsx

@@ -8,7 +8,6 @@ import {
   RefreshCcw,
   Upload,
 } from "lucide-react-native";
-import { GitHubIcon } from "@/components/icons/github-icon";
 import { GitActionsSplitButton } from "@/git/actions-split-button";
 import { useGitActions } from "@/git/use-actions";
 import type { Theme } from "@/styles/theme";
@@ -23,7 +22,6 @@ const ThemedGitCommitHorizontal = withUnistyles(GitCommitHorizontal);
 const ThemedDownload = withUnistyles(Download);
 const ThemedUpload = withUnistyles(Upload);
 const ThemedArrowDownUp = withUnistyles(ArrowDownUp);
-const ThemedGitHubIcon = withUnistyles(GitHubIcon);
 const ThemedGitMerge = withUnistyles(GitMerge);
 const ThemedRefreshCcw = withUnistyles(RefreshCcw);
 const ThemedArchive = withUnistyles(Archive);
@@ -37,11 +35,6 @@ const ICONS = {
   pull: <ThemedDownload size={16} uniProps={mutedColorMapping} />,
   push: <ThemedUpload size={16} uniProps={mutedColorMapping} />,
   pullAndPush: <ThemedArrowDownUp size={16} uniProps={mutedColorMapping} />,
-  viewPr: <ThemedGitHubIcon size={16} uniProps={mutedColorMapping} />,
-  createPr: <ThemedGitHubIcon size={16} uniProps={mutedColorMapping} />,
-  mergePrSquash: <ThemedGitHubIcon size={16} uniProps={mutedColorMapping} />,
-  mergePrMerge: <ThemedGitHubIcon size={16} uniProps={mutedColorMapping} />,
-  mergePrRebase: <ThemedGitHubIcon size={16} uniProps={mutedColorMapping} />,
   merge: <ThemedGitMerge size={16} uniProps={mutedColorMapping} />,
   mergeFromBase: <ThemedRefreshCcw size={16} uniProps={mutedColorMapping} />,
   archive: <ThemedArchive size={16} uniProps={mutedColorMapping} />,