feat(dross): global floating bubble; retire the right rail

Adds dross_bubble.js — a fixed FAB orb that opens a draggable,
anchored panel wired to wireAgentChat. Mic button rendered but
disabled (Phase 2). Swaps renderRightrail call in app.js; removes
dead <aside id="rightrail"> from index.html. rightrail.js kept in
place (unused).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

public/app.js

@@ -6,7 +6,7 @@ import { api } from './api.js';
 import { route, current, navigate } from './router.js';
 import { renderSidebar } from './components/sidebar.js';
 import { renderTopbar } from './components/topbar.js';
-import { renderRightrail } from './components/rightrail.js';
+import { renderDrossBubble } from './components/dross_bubble.js';
 import { emit, state } from './state.js';
 import { el, mount } from './dom.js';
 import { attachDropzone } from './components/dropzone.js';
@@ -84,7 +84,7 @@ async function init() {
   await loadTheme();            // apply saved palette overrides before rendering chrome
   renderTopbar(document.getElementById('topbar'));
   renderSidebar(document.getElementById('sidebar'));
-  renderRightrail(document.getElementById('rightrail'));
+  renderDrossBubble();
   initChrome();
   attachDropzone(document.getElementById('main'));
   route(renderView);

public/components/dross_bubble.js

@@ -0,0 +1,88 @@
+// public/components/dross_bubble.js
+// Global floating Dross companion. Replaces the per-Space right rail.
+import { el, mount } from '../dom.js';
+import { api } from '../api.js';
+import { state } from '../state.js';
+import { wireAgentChat } from './agent_chat.js';
+import { drossAvatar } from './dross_avatar.js';
+
+const TOOL_LABELS = { search: '🔍 searching', read: '📄 reading', context: '🧭 looking at this view', propose_change: '📝 drafting a change' };
+let cfg = { avatar: 'soft-eye', accent: '#a86adf', persona: '', voiceMode: 'review' };
+
+function applyAccent(node, hex) {
+  node.style.setProperty('--dross', hex);
+}
+
+export async function renderDrossBubble() {
+  try { cfg = { ...cfg, ...(await api.get('/api/dross/settings')) }; } catch { /* defaults */ }
+
+  const host = el('div', { class: 'dross-host' });
+  document.getElementById('shell').appendChild(host);
+
+  const fab = el('div', { class: 'dross-fab', title: 'Dross' },
+    el('div', { class: 'dross-ping', style: { display: 'none' } }, ''), drossAvatar(cfg.avatar, 60));
+  const log = el('div', { class: 'dross-log' });
+  const input = el('textarea', { rows: 1, placeholder: 'Ask Dross…' });
+  const sendBtn = el('button', { class: 'dross-send', title: 'Send' },
+    el('span', { html: '<svg viewBox="0 0 24 24" width="20" height="20" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M22 2 11 13M22 2l-7 20-4-9-9-4 20-7z"/></svg>' }));
+  const mic = el('button', { class: 'dross-mic', disabled: true, title: 'Voice arrives in Phase 2' },
+    el('span', { html: '<svg viewBox="0 0 24 24" width="22" height="22" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="9" y="3" width="6" height="11" rx="3"/><path d="M5 11a7 7 0 0 0 14 0"/><line x1="12" y1="18" x2="12" y2="22"/><line x1="8" y1="22" x2="16" y2="22"/></svg>' }), 'Hold to talk');
+  const closeBtn = el('button', { class: 'dross-x', title: 'Close' }, '⤬');
+  const header = el('div', { class: 'dross-hd' }, drossAvatar(cfg.avatar, 30),
+    el('div', { class: 'dross-who' }, 'Dross', el('small', {}, 'always here, regrettably')), closeBtn);
+  const collapse = el('div', { class: 'dross-collapse', title: 'Collapse' },
+    el('span', { class: 'grip' }), el('span', {}, '⌄ collapse'), el('span', { class: 'grip' }));
+  const panel = el('div', { class: 'dross-panel' }, header, log,
+    el('div', { class: 'dross-inwrap' }, input, el('div', { class: 'dross-btnrow' }, mic, sendBtn)), collapse);
+
+  host.append(fab, panel);
+  applyAccent(fab, cfg.accent); applyAccent(panel, cfg.accent);
+
+  const chat = wireAgentChat({
+    logEl: log, inputEl: input, sendBtnEl: sendBtn,
+    historyUrl: '/api/dross', turnUrl: '/api/dross/turn',
+    agentName: 'Dross', showDrafts: true, toolLabels: TOOL_LABELS,
+    turnBody: (text) => ({ text, view: state.view || null })
+  });
+  let loaded = false;
+
+  function openPanel() {
+    const r = fab.getBoundingClientRect();
+    panel.classList.add('open'); fab.style.display = 'none';
+    const pr = panel.getBoundingClientRect();
+    const left = Math.max(8, Math.min(r.right - pr.width, innerWidth - pr.width - 8));
+    const top = Math.max(8, Math.min(r.bottom - pr.height, innerHeight - pr.height - 8));
+    panel.style.right = 'auto'; panel.style.bottom = 'auto'; panel.style.left = left + 'px'; panel.style.top = top + 'px';
+    if (!loaded) { loaded = true; chat.load(); }
+    input.focus();
+  }
+  function closePanel() { panel.classList.remove('open'); fab.style.display = 'block'; }
+  fab.addEventListener('click', () => { if (fab._moved) { fab._moved = false; return; } openPanel(); });
+  closeBtn.addEventListener('click', closePanel);
+  collapse.addEventListener('click', closePanel);
+
+  drag(fab, fab, true); drag(header, panel, false);
+
+  window.addEventListener('dross-settings-changed', async () => {
+    try { cfg = { ...cfg, ...(await api.get('/api/dross/settings')) }; } catch { return; }
+    applyAccent(fab, cfg.accent); applyAccent(panel, cfg.accent);
+    mount(fab, el('div', { class: 'dross-ping', style: { display: 'none' } }), drossAvatar(cfg.avatar, 60));
+    header.replaceChild(drossAvatar(cfg.avatar, 30), header.firstChild);
+  });
+}
+
+function drag(handle, target, isFab) {
+  handle.addEventListener('pointerdown', (e) => {
+    if (e.target.closest('.dross-x') || e.target.closest('.dross-mic') || e.target.closest('.dross-send')) return;
+    e.preventDefault();
+    const r = target.getBoundingClientRect(); const sx = e.clientX, sy = e.clientY; let moved = false;
+    target.style.right = 'auto'; target.style.bottom = 'auto'; target.style.left = r.left + 'px'; target.style.top = r.top + 'px';
+    const mv = (ev) => {
+      const dx = ev.clientX - sx, dy = ev.clientY - sy; if (Math.abs(dx) + Math.abs(dy) > 4) moved = true;
+      target.style.left = Math.max(4, Math.min(innerWidth - r.width - 4, r.left + dx)) + 'px';
+      target.style.top = Math.max(4, Math.min(innerHeight - r.height - 4, r.top + dy)) + 'px';
+    };
+    const up = () => { document.removeEventListener('pointermove', mv); document.removeEventListener('pointerup', up); if (isFab) target._moved = moved; };
+    document.addEventListener('pointermove', mv); document.addEventListener('pointerup', up);
+  });
+}

public/index.html

@@ -39,7 +39,6 @@
     <header id="topbar"></header>
     <aside id="sidebar"></aside>
     <main id="main"></main>
-    <aside id="rightrail"></aside>
   </div>
   <div id="modal-root"></div>
   <script type="module" src="/app.js"></script>