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>

TODO.md

@@ -3,19 +3,12 @@
 Working list from Iris, 2026-09-03. Remove an entry when it lands; annotate
 one in place when it turns out to need a decision.
 
-## App — composer and input
-
-- [ ] Make the file-add button and the ones beside it "bubble" buttons with a
-      visible outline. The popups they open should be round.
-- [ ] Returning to the app must not open the keyboard if it was closed when
-      the app was left.
-- [ ] Tapping a slash-command suggestion should move the cursor to the end of
-      the inserted suggestion.
-
 ## App — transcript
 
-- [ ] Tapping an expanded agent message card should close it.
-- [ ] Tapping to deselect text should not toggle card expansion.
+- [ ] Tapping an expanded agent message card should close it. — a tap that
+      clears a selection now spends itself on that and nothing else
+      (`SessionScreen.expanding`); still to check on the emulator whether a tap
+      with *no* selection reaches an opened peer card at all.
 - [ ] Text inside code blocks does not highlight when selected (selection
       itself works — only the highlight is missing).
 - [ ] Bash logs should apply colour and the other basic text escape sequences,
@@ -37,22 +30,12 @@ one in place when it turns out to need a decision.
       stacking them all in a row.
 - [ ] Submit stays greyed out until every question is answered.
 
-## Formatting
-
-- [ ] Show a timeout in the largest possible unit: 480000ms = 8m. Under a
-      minute show only the largest unit (2.5s, 30ms); at or over a minute show
-      all units (5d 12h 4m).
-- [ ] Use tilde notation when moving the working directory.
-
 ## Session settings
 
 - [ ] Autocompact belongs in session settings; empty disables it, which is the
       default.
 - [ ] Changing the model on a stopped provider should be possible, stored, and
       applied the next time it starts.
+- [ ] Switching models must not warn when there is no context for the warning to
+      matter — e.g. straight after a clear.
 
-## Usage
-
-- [ ] Add one minute to Claude's "time left".
-- [ ] The transcript header and the usage menu should share one usage value —
-      they have been seen disagreeing.