Read a timeout in units, share one usage answer, and let a tilde mean home

The composer's settings row is outlined bubbles opening round menus, and
the message box is a TextFieldValue so anything put into it without being
typed -- a draft, a share, a slash command -- leaves the cursor at the end.

A tap that puts a text selection away no longer also collapses the card the
text was drawn in: every open and close on the session screen goes through
one guard that spends such a press on the selection.

The usage bar and the usage dialog were two polls of one measurement and
disagreed for up to a minute at a time; they are one feed now, and the
countdown rounds up to the minute in the one place both read.

A working directory typed as ~/repos/ai-app was four literal characters on
the local transport and as an argument on both, so the existence check
refused every home-relative path. It is checked by entering the directory
now, expanded for a local spawn the way the remote shell expands it, and
stored short so the phone draws what somebody would write.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

app/androidApp/src/main/kotlin/com/example/aiapp/NerdIcons.kt

@@ -1,10 +1,13 @@
 package com.example.aiapp
 
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.size
+import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.semantics.contentDescription
@@ -190,6 +193,24 @@ fun GlyphButton(
     }
 }
 
+/**
+ * The square a glyph button occupies, with a spinner in it instead of a mark.
+ *
+ * For a button whose work is under way. It takes the button's whole box rather than the mark's, so
+ * swapping one for the other leaves everything in the row exactly where it was -- a control that
+ * changed the width of its header while it worked would move its neighbours at the moment somebody
+ * was pressing them.
+ */
+@Composable
+fun GlyphSpinner(label: String, modifier: Modifier = Modifier) {
+    Box(
+        contentAlignment = Alignment.Center,
+        modifier = modifier.size(GLYPH_BUTTON_SIZE).semantics { contentDescription = label },
+    ) {
+        CircularProgressIndicator(Modifier.size(GLYPH_EXTENT), strokeWidth = 2.dp)
+    }
+}
+
 /**
  * One icon, drawn as text.
  *