Merge branch 'refactor/groups-phase1'

Groups refactor, phases 1-3.

The root model replaces the old `upload` flag and group-wide `member_upload`
with per-root `writable`/`removable`/`ejected`, carried by a `RootSet` that
both front doors — the loopback API and signed MNP — reach through the same
`ops` functions. MNP goes to 1.1, additively: the roots table now rides on
`index_delta`, so a root added, removed, ejected or plugged reaches every
connected client instead of only whoever reloaded.

The group UI becomes a plugin architecture: an application is a registry
entry in `apps.js` plus its own files, with directories stored generically
by `ops.set_app_directories` under whatever the app is called. A reference
application, hidden behind `?dev=1`, is what makes that claim testable —
adding it is what found the two places still naming apps by hand.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011pvMdvLBG92jyhvD5pD6us

1 files changed, 67 insertions, 0 deletions

diff --git a/packages/meshbay-hub/src/meshbay_hub/static/chat-app-settings.js b/packages/meshbay-hub/src/meshbay_hub/static/chat-app-settings.js
new file mode 100644
index 0000000..96fc52f
--- /dev/null
+++ b/packages/meshbay-hub/src/meshbay_hub/static/chat-app-settings.js
@@ -0,0 +1,67 @@
+import { html, useState, useEffect } from './vendor/htm-preact.js';
+import { t } from './i18n.js';
+import { ToggleSwitch, useSaver } from './settings-ui.js';
+import { FolderPickerField } from './folder-tree.js';
+
+/**
+ * Chat's operator settings.
+ *
+ * Every app's settings pane takes the same props (see `apps.js`): the group's
+ * roots and known folders, the node's current answers, a `saveDirectories`
+ * bound to this app, and the transport for anything the app alone needs. It
+ * owns its drafts and its own busy state, and the page renders it without
+ * naming it.
+ *
+ * The directory here is unlike every other app's. Videos, Music and Photos
+ * point at folders they *read*; this is where attachments get *written*, so it
+ * has to be on a read-write root. The picker greys out the rest rather than
+ * letting the node's refusal arrive after the fact.
+ */
+function ChatSettings({ roots, dirs, settings, saveDirectories, transport, signFn }) {
+  const { busy, msg, run } = useSaver();
+  const [directory, setDirectory] = useState(settings.chatDirectory || '');
+  const [linkPreview, setLinkPreview] = useState(settings.chatLinkPreview !== false);
+
+  // Re-seeded from the node's answer: another operator may be editing the
+  // same group, and their change arrives here as a prop.
+  useEffect(() => { setDirectory(settings.chatDirectory || ''); },
+            [settings.chatDirectory]);
+  useEffect(() => { setLinkPreview(settings.chatLinkPreview !== false); },
+            [settings.chatLinkPreview]);
+
+  const noWritable = !(roots || []).some((r) => r.writable);
+  const dirty = directory !== (settings.chatDirectory || '');
+
+  return html`
+    <div class="app-settings">
+      ${noWritable && html`
+        <p class="settings-hint">${t('settings_app.chat_no_writable_root')}</p>`}
+
+      <${FolderPickerField}
+        label=${t('settings_app.chat_directory_label')}
+        hint=${t('settings_app.chat_directory_hint')}
+        roots=${roots} dirs=${dirs}
+        mode="single" requireWritable=${true}
+        value=${directory} disabled=${busy || noWritable}
+        onChange=${setDirectory} />
+
+      <button class="app-save" disabled=${busy || !dirty}
+        onClick=${() => run(() => transport.setChatDirectory(directory, signFn))}>
+        ${busy ? t('settings_app.saving') : t('settings_app.save')}
+      </button>
+
+      <div class="settings-row" style="margin-top:12px">
+        <${ToggleSwitch} checked=${linkPreview} disabled=${busy}
+          onChange=${(v) => {
+            setLinkPreview(v);
+            run(() => transport.setChatLinkPreview(v, signFn));
+          }}
+          label=${t('settings_app.chat_link_preview_label')} />
+        <p class="settings-hint">${t('settings_app.chat_link_preview_hint')}</p>
+      </div>
+      ${msg && html`<p class="settings-hint">${msg}</p>`}
+    </div>
+  `;
+}
+
+export { ChatSettings };