Attach any file, take shares from other apps, and survive a backwards highlight

Attachments were images only. Now any file can be attached: from the file
chooser behind the "+" menu, or from Android's share sheet, which the app
is now in. An image still goes to the model as a picture; anything else is
stored under its own name (`<hex>-<name>`, cleaned by `safe_file_name`)
and the Claude driver ends the message with `Attached file: /abs/path`,
since the CLI reads files by path and a model cannot be shown a trace. The
user-message field is renamed `images` -> `attachments` on both sides,
with a serde alias reading the rows written before. A share arrives before
anyone has said which session it is for, so it is held in AppRoot with a
banner on the list until a session takes it; an open session takes it at
once. Unreadable shares are reported beside the composer, not thrown.

The tool card crashed the app when opened on a command holding a quoted
glob such as `-path '*/.git/*'`: highlights 1.1.0's shell lexer answers
`x '*/a/*'` with a span whose end is before its start, and AnnotatedString
refuses the range. Such spans are dropped; the library is the place for
the fix. The echo driver gains `/bash <command>` so a card with a given
command can be produced on the emulator.

ui-sandbox.sh's token salvage read the tokens block's close only at a line
start, ran past the compact `),],` the server writes, and copied `setups`
into the new config twice, which the server then refused.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

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

@@ -1,6 +1,7 @@
 package com.example.aiapp
 
 import androidx.activity.compose.BackHandler
+import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
@@ -46,6 +47,8 @@ private enum class MainTab(val label: String) {
 fun MainScreen(
     settings: ServerSettings,
     reloadToken: Int,
+    /** What another app shared in and no session has taken yet; see [ShareRequest]. */
+    share: ShareRequest? = null,
     onOpen: (SessionSummary) -> Unit,
     onSpawn: () -> Unit,
     onImported: (SessionSummary) -> Unit,
@@ -106,6 +109,24 @@ fun MainScreen(
                 GlyphButton(SETTINGS_GLYPH, "Settings", onSettings)
             }
         }
+        // What is waiting to be attached, and what to do about it. Said here because the list
+        // below is where the choice is made, and a share that arrived with nothing on screen
+        // saying so would read as a tap that did nothing.
+        share?.let {
+            Text(
+                it.summary() + " -- open the session it belongs in.",
+                style = MaterialTheme.typography.bodyMedium,
+                color = MaterialTheme.colorScheme.onPrimaryContainer,
+                modifier =
+                    Modifier.fillMaxWidth()
+                        .padding(horizontal = 16.dp, vertical = 8.dp)
+                        .background(
+                            MaterialTheme.colorScheme.primaryContainer,
+                            MaterialTheme.shapes.small,
+                        )
+                        .padding(12.dp),
+            )
+        }
         // Primary rather than the plain TabRow, which is deprecated in favour of the two that
         // say where they sit: these are the app's top-level destinations.
         PrimaryTabRow(selectedTabIndex = tab.ordinal) {