hide sidebar clock and contact email on phones

agents.md

@@ -172,6 +172,9 @@ Themes: `web` = default frosted-glass website (sidebar + content, light/dark),
 - The desktop switch (`.web-ctl-desktop`) is hidden on phones: under the
   `max-width: 960px` breakpoint and under `(hover: none) and (pointer: coarse)`.
   There is no device sniff anymore — phones just get the responsive web shell.
+- The sidebar foot (`.web-side-foot` — the live clock + contact email and its
+  top divider) is hidden on phones under `max-width: 640px`. In the collapsed
+  top panel it's just noise; the desktop/tablet sidebar keeps it.
 - Under `max-width: 640px` the year-grid heatmap (`.heatmap-container`) and its
   legend/hover row (`.heatmap-status-row`) are `display: none` — the grid is
   unreadable at phone widths. The contribution total and the commit history

src/app/web.css

@@ -1136,6 +1136,11 @@ html[data-theme="web"][data-scheme="dark"] .heatmap-legend-cell[data-level="4"]
   .heatmap-status-row {
     display: none;
   }
+  /* Phones drop the sidebar foot (clock + mail + its divider) too: in the
+     collapsed top panel it's just noise. The desktop sidebar keeps it. */
+  .web-side-foot {
+    display: none;
+  }
 }
 
 @media (max-width: 400px) {