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/TranscriptItems.kt

@@ -42,7 +42,7 @@ sealed class TranscriptItem {
         override val seq: Long,
         val text: String,
         /** Refs of what was attached, drawn inside the bubble. */
-        val images: List<String> = emptyList(),
+        val attachments: List<String> = emptyList(),
     ) : TranscriptItem()
 
     data class AssistantMsg(
@@ -375,7 +375,7 @@ private fun splitRun(tail: List<TranscriptItem>, behind: String?): List<Transcri
 fun foldEvent(items: List<TranscriptItem>, entry: SeqEvent): List<TranscriptItem> =
     when (val event = entry.event) {
         is SessionEvent.UserMessage ->
-            items + TranscriptItem.UserMsg(entry.seq, event.text, event.images)
+            items + TranscriptItem.UserMsg(entry.seq, event.text, event.attachments)
         is SessionEvent.AssistantText -> {
             // Deltas accumulate into the message they're streaming, which keeps the seq of the
             // first of them: a row whose identity changed with every delta would be a new row on