feat(mobile): add the mobile app shell, capture and the /mobile/ build page

Five tabs (Now, Globe, Capture, Threads, You) over one persistent globe:
a live situation feed whose cards open into the world with a detented
brief, the lens dock and time ribbon, AR Look and signed Witness
capture (ECDSA P-256 in IndexedDB, SHA-256 hash chain, IMU and GPS
trace, eight-check verify), the Bhote Koshi reconstruction thread with
a live ledger, and hinge-aware two-pane layouts for foldables.

The production build now emits mobile/index.html beside the app; the
panel build keeps the app alone.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01VVYRAqiQj9Y1V9ZfG1RcDH

mobile/styles/globe-ui.css

@@ -82,11 +82,65 @@
   animation: view-in var(--dur-3) var(--spring) both;
 }
 
-.app.is-world .gc-readout,
-.app.is-world .gc-attr {
+.app.is-world .gc-readout {
   visibility: hidden;
 }
 
+/* Attribution stays on screen whenever the globe is (provider terms). */
+.app.is-world .gc-attr {
+  top: calc(var(--safe-t) + 60px);
+}
+
+.gc-attr.has-onscreen {
+  color: var(--ink-2);
+}
+
+.gc-labels {
+  position: absolute;
+  inset: 0;
+  pointer-events: none !important;
+  overflow: hidden;
+  z-index: 0;
+}
+
+.gc-labels span {
+  position: absolute;
+  left: 0;
+  top: 0;
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  margin: -9px 0 0 8px;
+  height: 18px;
+  padding: 0 6px 0 5px;
+  border-radius: 9px;
+  background: rgba(5, 7, 11, 0.58);
+  font-family: var(--mono);
+  font-size: 0.625rem;
+  font-weight: 600;
+  color: var(--ink);
+  white-space: nowrap;
+  will-change: transform;
+}
+
+.gc-labels i {
+  width: 5px;
+  height: 5px;
+  border-radius: 50%;
+  background: var(--fam, var(--ink-3));
+}
+
+.tile.soon {
+  opacity: 0.5;
+  background: transparent;
+  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
+}
+
+.tile.soon .tile-status {
+  font-style: normal;
+  color: var(--ink-4);
+}
+
 /* Lens popover */
 .lens-pop {
   position: absolute;
@@ -735,6 +789,12 @@
   color: var(--fam);
 }
 
+/* The headline number belongs to the peek detent; taller detents show it in
+   the labelled metrics row instead of twice. */
+.brief-sheet:not([data-detent='peek']) .peek-metric {
+  display: none;
+}
+
 .peek-metric small {
   font-size: 0.75rem;
   font-weight: 650;