Say which half of the wait a llama turn is in

A turn has two waits in front of the first token and they were one word.
`SessionStatus::Loading` was already the model coming off disk; this adds
`SessionStatus::Reading` for llama-server processing the prompt -- emitted when
the request goes out, cleared by the first thing the model says of any kind, so
it covers every generate in a tool loop rather than only the first.

Prefill is the expensive half on this machine: measured 9.5s for 6,068 tokens
and 22s for 14,068 on the 27B with the GPU to itself. Reported as `running`
that was indistinguishable from a model thinking, which is the thing the reader
is waiting for. The phone draws both with the working spinner and its own
words -- "loading model" and "reading prompt" -- and the session screen's
status row now spins for all three busy states instead of only `running`,
which is also how `loading` stops being a bare word with nothing moving.

Measured while checking the tok/s figure, and recorded in the rigs skill: the
27B holds 55.5 to 50.3 tok/s between 1.5k and 14k of context, so decode decays
gently, while the 0.6B on the CPU falls 30.1 to 11.5 over 6k. A shared GPU is a
different failure -- the model does not load at all.

Verified on the emulator against a real llama session: "loading model" while
the server started, then "reading prompt" with the spinner through prompt
processing, then the thinking card.

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

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

@@ -2628,7 +2628,15 @@ private fun SessionStatusRow(
                     modifier = Modifier.weight(1f).padding(horizontal = 8.dp),
                 )
             }
-            "running" -> {
+            // The three states with something happening in them and nothing wanted from the
+            // reader. One branch, because what they share is the spinner -- the machine is busy --
+            // and what differs is only which part of the wait this is: the model coming off disk,
+            // the model reading what it was given, and the model answering. Reading used to be
+            // reported as running, so the minutes a long conversation spends on prompt processing
+            // were indistinguishable from a model thinking.
+            "running",
+            "reading",
+            "loading" -> {
                 CircularProgressIndicator(
                     // Smaller than the line beside it, so the row keeps the text's own height: a
                     // control taller than a line re-centres it and knocks it out of line with the
@@ -2637,7 +2645,9 @@ private fun SessionStatusRow(
                     strokeWidth = 2.dp,
                 )
                 Text(
-                    "working",
+                    // "working" rather than "running" for the one that is generating: the word is
+                    // there to say the machine is busy, and the other two say what it is busy at.
+                    if (status == "running") "working" else sessionStatusWord(status, subagent),
                     style = MaterialTheme.typography.labelSmall,
                     color = MaterialTheme.colorScheme.onSurfaceVariant,
                     modifier = Modifier.padding(start = 8.dp),