feat: Phase 1 — extract the client (web SPA + desktop) to dtoro/oikos-web

Problem: the hexagonal refactor churns the backend tree for nine more
phases; the UI delivery stack (web/ SPA, cmd/desktop Wails wrapper,
compose/web image) must move to its own repo first so doc/layout
rewrites land once on a backend-only tree.

Change:
- New repo git.hubris.network/dtoro/oikos-web (v0.33.0): web/, desktop/
  (updateURL repointed to oikos-web releases), compose/, own CI (web +
  desktop jobs), own deploy script (CI-green gate, TOCTOU guard,
  version-tagged images, prune-to-3), own webhook receiver on :9798 +
  launchd unit, own compose project publishing the same 8091:80.
- Cutover executed on mac-mini in order: oikos stack's web service
  stopped+removed, oikos-web project brought up on 8091; outer Caddy
  untouched (targets the published port) — serving + Authentik flow +
  /wails 404 quirk verified post-cutover.
- Stripped from oikos: web/, cmd/desktop/, compose/web/, desktop CI
  workflow, ci.yml web job, Makefile ui/desktop/desktop-package/install
  targets, the compose web service, oikos-web from deploy.sh's fallback
  prune list; wails + go-keyring dropped from go.mod, vendor synced.
- README / CONTRIBUTING / AGENTS.md / .agents dev+operations docs now
  point at the new repo; mbse + mascot design docs carry a path note.

Risk: production SPA serving depends on the new pipeline now; rollback
is versioned-image re-up of the old web service from a pre-split
checkout (port 8091). Desktop builds installed before the split still
check dtoro/oikos releases — one manual reinstall, noted in the
oikos-web release notes.

Verification: go vet, make test (race), make generate-check, golangci
(no new findings; baseline down 400→365); post-cutover curls —
localhost:8091 200, /wails/runtime.js 404, outer Caddy 302 Authentik.

web/node_modules/bits-ui/dist/internal/get-directional-keys.js

@@ -0,0 +1,37 @@
+import { kbd } from "./kbd.js";
+export const FIRST_KEYS = [kbd.ARROW_DOWN, kbd.PAGE_UP, kbd.HOME];
+export const LAST_KEYS = [kbd.ARROW_UP, kbd.PAGE_DOWN, kbd.END];
+export const FIRST_LAST_KEYS = [...FIRST_KEYS, ...LAST_KEYS];
+export const SELECTION_KEYS = [kbd.SPACE, kbd.ENTER];
+/**
+ * A utility function that returns the next key based on the direction and orientation.
+ */
+export function getNextKey(dir = "ltr", orientation = "horizontal") {
+    return {
+        horizontal: dir === "rtl" ? kbd.ARROW_LEFT : kbd.ARROW_RIGHT,
+        vertical: kbd.ARROW_DOWN,
+    }[orientation];
+}
+/**
+ * A utility function that returns the previous key based on the direction and orientation.
+ */
+export function getPrevKey(dir = "ltr", orientation = "horizontal") {
+    return {
+        horizontal: dir === "rtl" ? kbd.ARROW_RIGHT : kbd.ARROW_LEFT,
+        vertical: kbd.ARROW_UP,
+    }[orientation];
+}
+/**
+ * A utility function that returns the next and previous keys based on the direction
+ * and orientation.
+ */
+export function getDirectionalKeys(dir = "ltr", orientation = "horizontal") {
+    if (!["ltr", "rtl"].includes(dir))
+        dir = "ltr";
+    if (!["horizontal", "vertical"].includes(orientation))
+        orientation = "horizontal";
+    return {
+        nextKey: getNextKey(dir, orientation),
+        prevKey: getPrevKey(dir, orientation),
+    };
+}