feat(ui): an indexing dock above the music bar, on every page

Adding a large directory left the operator nothing to look at once they left
the Settings panel that started it, and nothing at all when it was added from
another machine. A band now sits above the music bar on every page: one row
per group with indexing under way, naming the root being walked, percent,
bytes and files, and the roots waiting their turn; "indexing finished" for a
few seconds at the end. A click opens the group's Settings, and × hides the
row until that group is idle.

Two sources feed it. On the node's own machine the desktop client polls the
loopback `GET /api/index-status` for every group, whatever the route. An
operator's group page forwards MNP `index_progress` pushes, resolving the
root from the roots table it opened; an ordinary member keeps the sidebar dot
only, and a page clears its row when it lets go of the group. Where both
describe a group, loopback wins.

Reconcile passes and watchdog bursts show only past 1 GB or 5 s, so a single
dropped file does not flash a bar. The logic lives in index-dock-model.js,
which has no imports and is tested under node. The dock publishes
`--index-dock-h` and the sidebar stops above it and the music bar.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T6jPTeocXA1BePekdsgPya

1 files changed, 97 insertions, 2 deletions

diff --git a/packages/meshbay-hub/src/meshbay_hub/static/style.css b/packages/meshbay-hub/src/meshbay_hub/static/style.css
index 871ca0a..a2ef80e 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/style.css
+++ b/packages/meshbay-hub/src/meshbay_hub/static/style.css
@@ -73,6 +73,8 @@
   --toolbar-h: 0px;
   /* Published by the music bar while it is on screen (sticky.js). */
   --music-bar-h: 0px;
+  /* Published by the indexing dock, which sits on top of the music bar. */
+  --index-dock-h: 0px;
 }
 
 /* ── Reset ────────────────────────────────────────────────────────────────── */
@@ -400,7 +402,7 @@ a:hover { text-decoration: underline; }
   display: flex;
   flex-direction: column;
   width: 240px;
-  height: calc(100vh - var(--nav-h) - var(--music-bar-h));
+  height: calc(100vh - var(--nav-h) - var(--music-bar-h) - var(--index-dock-h));
   background: var(--sidebar-bg);
   border-right: 1px solid var(--border);
   padding: 16px 0 0;
@@ -2512,7 +2514,7 @@ a.transfer-name {
     position: fixed;
     left: -240px;
     top: 52px;
-    height: calc(100vh - 52px - var(--music-bar-h));
+    height: calc(100vh - 52px - var(--music-bar-h) - var(--index-dock-h));
     z-index: 50;
     transition: left 0.2s;
     box-shadow: none;
@@ -4287,6 +4289,99 @@ h2 .gn-owner, h3 .gn-owner { font-size: 0.55em; }
   border-radius: 10px;
 }
 
+/* ── Indexing dock (index-dock.js) ────────────────────────────────────────
+   Sticky for the music bar's reason. It is rendered right before that bar, so
+   `bottom: var(--music-bar-h)` stacks it on top when both are pinned, and it
+   publishes its own height as `--index-dock-h` for the sidebar to stop above
+   the two of them. */
+.index-dock {
+  position: sticky;
+  bottom: var(--music-bar-h);
+  z-index: 50;
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  margin-top: 16px;
+}
+.index-dock-row {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  padding: 8px 12px;
+  background: var(--bg-raised);
+  border: 1px solid var(--border);
+  border-radius: 10px;
+}
+.index-dock-main {
+  flex: 1 1 auto;
+  min-width: 0;
+  display: block;
+  padding: 0;
+  border: 0;
+  background: none;
+  color: inherit;
+  font: inherit;
+  text-align: left;
+  cursor: pointer;
+}
+.index-dock-head {
+  display: flex;
+  align-items: baseline;
+  justify-content: space-between;
+  gap: 12px;
+  font-size: 0.85em;
+}
+.index-dock-title {
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+.index-dock-meta {
+  color: var(--text-dim);
+  white-space: nowrap;
+  font-variant-numeric: tabular-nums;
+}
+.index-dock-bar { display: block; margin: 6px 0 0; }
+.index-dock-bar .index-progress-fill { display: block; }
+.index-dock-done .index-progress-fill { background: var(--success); }
+/* Walking the tree, or waiting for another root: no percentage to show yet,
+   and a bar parked at 0 % reads as stuck. */
+.index-dock-indeterminate { animation: index-dock-sweep 1.4s ease-in-out infinite; }
+@keyframes index-dock-sweep {
+  from { transform: translateX(-100%); }
+  to   { transform: translateX(340%); }
+}
+.index-dock-next {
+  display: block;
+  margin-top: 4px;
+  font-size: 0.78em;
+  color: var(--text-dim);
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+.index-dock-hide {
+  flex-shrink: 0;
+  display: inline-flex;
+  padding: 4px;
+  border: 0;
+  border-radius: 6px;
+  background: none;
+  color: var(--text-dim);
+  cursor: pointer;
+}
+.index-dock-hide:hover { background: var(--bg-surface); }
+.index-dock-hide .icon { width: 16px; height: 16px; }
+@media (max-width: 640px) {
+  .index-dock-head { flex-direction: column; gap: 2px; }
+  .index-dock-title,
+  .index-dock-meta { white-space: normal; }
+}
+@media (prefers-reduced-motion: reduce) {
+  .index-dock-indeterminate { animation: none; }
+}
+
 .music-player-info {
   display: flex;
   align-items: center;