Give the phone the rest of its screens, and a way in

All seven screens of the design, plus the two it does not draw because it starts at an
enrolled phone: naming a server, and choosing a passphrase.

The five states docs/android-port.md worried about losing at 360dp are all here and none
of them softened. The changed-key refusal is a full-screen panel rather than a bottom
sheet, because a sheet is swipe-to-dismiss by convention and that screen must have no way
forward. The recovery code raises FLAG_SECURE for its own state and lowers it afterwards,
so the sentence about screenshots is true rather than decorative. The delete
confirmations keep their counts and replace the row in place.

Signing in works, and the seam it needed is worth more than the implementation:
IAuthorizationCallback now sits between OidcClient and the loopback listener, so the two
heads differ in where the response arrives and in nothing else. PKCE, the state check,
discovery, the token exchange and the key binding stay one implementation — a second OIDC
client would be a second place for a security bug to live. The phone registers a
private-use scheme with the system rather than binding a loopback port, which on a shared
device any other app can do first.

The accessory key row needed TerminalWorkspace.SendInputAsync: ordinary typing goes from
the renderer straight down the socket, and there was no way in for the keys a software
keyboard does not have. Ctrl latches, because one thumb cannot chord, and the latch is
drawn — a modifier that is on and does not look on is how somebody sends ^L to a database
prompt believing they typed an l.

597 client tests green, including two new ones for the input path and one for the
terminal surface command. Nothing has run on a device.

src/DodoSSH.Client.Terminal/TerminalWorkspace.cs

@@ -335,6 +335,45 @@ public sealed class TerminalWorkspace : IAsyncDisposable
         return true;
     }
 
+    /// <summary>
+    /// Sends keystrokes to one terminal as though they had been typed into it.
+    /// </summary>
+    /// <remarks>
+    /// <para>
+    /// Ordinary typing does not come through here — it goes from the renderer's own keyboard handling
+    /// straight down the socket, which is one hop shorter and is what keeps a fast <c>cat</c> responsive.
+    /// This is for input that has no key on the keyboard to produce it.
+    /// </para>
+    /// <para>
+    /// <b>Which on a phone is most of the useful input.</b> A software keyboard has no Ctrl, Esc, Tab or
+    /// arrows, so the Android head draws an accessory row and sends the bytes itself; the desktop head
+    /// will want the same seam the day it grows a snippet that types into a terminal. Bytes rather than a
+    /// key name deliberately: what a terminal wants is a control sequence, and translating one at this
+    /// layer would mean owning a keymap that the renderer already owns.
+    /// </para>
+    /// <para>
+    /// A session id this workspace does not know is ignored rather than throwing. The caller is a tab
+    /// strip, and a tab that closed while a key was in flight is ordinary rather than exceptional.
+    /// </para>
+    /// </remarks>
+    /// <param name="sessionId">The terminal to type into.</param>
+    /// <param name="data">Raw bytes, already encoded as the remote expects them.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    public ValueTask SendInputAsync(
+        uint sessionId,
+        ReadOnlyMemory<byte> data,
+        CancellationToken cancellationToken)
+    {
+        TerminalSessionPump? pump;
+
+        lock (sessionGate)
+        {
+            pump = sessions.TryGetValue(sessionId, out var session) ? session.Pump : null;
+        }
+
+        return pump is null ? ValueTask.CompletedTask : pump.WriteInputAsync(data, cancellationToken);
+    }
+
     /// <summary>
     /// Closes one terminal.
     /// </summary>

src/DodoSSH.Client.Terminal/packages.lock.json

@@ -65,6 +65,14 @@
           "Microsoft.Extensions.Logging.Abstractions": "8.0.3"
         }
       }
+    },
+    "net10.0/android-arm64": {
+      "libsodium": {
+        "type": "CentralTransitive",
+        "requested": "[1.0.22, )",
+        "resolved": "1.0.22",
+        "contentHash": "KPD9SloJFclrsjnhABu7dzWrcyYkwPbvx5l1gRSPAX/0n+OBtSiVCKtGFv4n+ecWUHU0tCG9LSSwoZZx673zBQ=="
+      }
     }
   }
 }