Implement the Gitea extension

The repository was a bare Nova scaffold. This builds it out to match the
capabilities of the official Gitea VS Code extension.

Sidebar sections:
  - Current Branch: pull requests and workflow runs for the checked-out
    branch, with a current/all/pinned branch filter
  - Workflows: runs grouped by workflow file, expanding into jobs, steps,
    and artifacts
  - Pull Requests: open pull requests across repositories, expanding into
    reviews, review comments, and changed files
  - Settings: per-instance connection state, plus repository Actions
    secrets and variables

Commands cover run control (re-run, re-run failed jobs, re-run a job,
cancel), job logs, artifact download/reveal/open, pull request overview,
diff, checkout, creation, merge and close, the full review cycle, and
secret and variable management. Multiple instances are supported, routed
by git remote host, with tokens held per instance in the Keychain.

Nova exposes no webview, diff editor, editor decorations, or extension
status bar, so four features are shaped differently from the VS Code
original: the pull request timeline renders as Markdown, diffs open as
unified .diff documents, review comments are published through an
IssueCollection so they appear in the gutter and the Issues sidebar, and
a failed run posts a notification. OAuth and insecureSkipVerify have no
Nova equivalent and are omitted. README.md records all of this.

Endpoints were taken from Gitea's published swagger.v1.json. Servers
predating the workflow runs API fall back to /actions/tasks.

Tests/ runs the extension's real code under Node against a stubbed Nova
runtime and a canned Gitea instance: 88 checks, no install step and no
network. Images are generated by Tools/make-icons.py.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01MQuusXgZC2dzwpJJ1qhtti

Scripts/views/nodes.js

@@ -0,0 +1,135 @@
+//
+// Node model shared by every sidebar section. Nova's TreeItem has no badge or
+// status colour, so run state is carried by a leading glyph in the item name
+// and by descriptive text on the trailing edge.
+//
+
+const time = require("../util/time.js");
+
+const RUN_GLYPHS = {
+    success: "✓",
+    failure: "✗",
+    failed: "✗",
+    error: "✗",
+    timed_out: "✗",
+    cancelled: "⊘",
+    canceled: "⊘",
+    skipped: "⊝",
+    running: "●",
+    in_progress: "●",
+    queued: "◌",
+    waiting: "◌",
+    pending: "◌",
+    blocked: "◌",
+};
+
+function glyphFor(statusOrConclusion) {
+    const key = String(statusOrConclusion || "").toLowerCase();
+    return RUN_GLYPHS[key] || "•";
+}
+
+/** A completed run reports state via `conclusion`; a live one via `status`. */
+function runState(run) {
+    const conclusion = String(run.conclusion || "").toLowerCase();
+    if (conclusion) return conclusion;
+    return String(run.status || "").toLowerCase() || "unknown";
+}
+
+function pullRequestGlyph(pull) {
+    if (pull.merged) return "⤳";
+    if (pull.state === "closed") return "⊘";
+    if (pull.draft) return "◌";
+    return "◆";
+}
+
+function reviewGlyph(state) {
+    const key = String(state || "").toUpperCase();
+    if (key === "APPROVED") return "✓";
+    if (key === "REQUEST_CHANGES" || key === "CHANGES_REQUESTED") return "✗";
+    if (key === "PENDING") return "◌";
+    return "◆";
+}
+
+let counter = 0;
+
+/**
+ * Builds a tree node. `children` is a resolved array; `load` is an async
+ * producer used for rows that fetch on expand.
+ */
+function node(kind, name, options = {}) {
+    counter += 1;
+    const value = {
+        kind: kind,
+        name: name,
+        identifier: options.identifier || `${kind}-${counter}`,
+        descriptiveText: options.description || "",
+        tooltip: options.tooltip || "",
+        image: options.image || null,
+        contextValue: options.contextValue || kind,
+        command: options.command || null,
+        path: options.path || null,
+        data: options.data || null,
+        repo: options.repo || null,
+        children: options.children || null,
+        load: options.load || null,
+        expanded: options.expanded === true,
+        parent: null,
+    };
+
+    if (value.children) {
+        for (const child of value.children) child.parent = value;
+    }
+    return value;
+}
+
+function message(text, kind = "message") {
+    return node(kind, text, { contextValue: "message" });
+}
+
+function errorNode(text) {
+    return node("error", `⚠ ${text}`, { contextValue: "message", tooltip: text });
+}
+
+/** Formats "12s · 3m ago" style trailing text for a run or job. */
+function timingText(entity) {
+    const parts = [];
+    const length = time.duration(entity.started_at, entity.completed_at);
+    if (length) parts.push(length);
+    const when = time.relative(entity.started_at || entity.created_at || entity.updated_at);
+    if (when) parts.push(when);
+    return parts.join(" · ");
+}
+
+function runTitle(run) {
+    return (
+        run.display_title ||
+        run.title ||
+        run.name ||
+        (run.path ? run.path.split("/").pop() : null) ||
+        `Run #${run.run_number || run.id}`
+    );
+}
+
+/** Groups runs by their workflow file, falling back to the run's own name. */
+function workflowKey(run) {
+    if (run.path) return run.path;
+    if (run.workflow_id) return String(run.workflow_id);
+    return run.name || "Workflow";
+}
+
+function workflowLabel(run) {
+    if (run.path) return run.path.split("/").pop();
+    return run.name || "Workflow";
+}
+
+exports.node = node;
+exports.message = message;
+exports.errorNode = errorNode;
+exports.glyphFor = glyphFor;
+exports.runState = runState;
+exports.pullRequestGlyph = pullRequestGlyph;
+exports.reviewGlyph = reviewGlyph;
+exports.timingText = timingText;
+exports.runTitle = runTitle;
+exports.workflowKey = workflowKey;
+exports.workflowLabel = workflowLabel;