fix(code): anchor toasts above the chat input

[Mason Daugherty (mdrxy)]

Toasts no longer cover the chat input — they now float directly above the input box.

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Textual docks its ToastRack to the bottom of the screen, which puts every toast on top of the composer the user is typing into. Rather than restyling individual toasts, the app now tracks the bottom chrome (subagent panel, startup tip, goal status, chat input, and status bar) and widens the rack's bottom margin so the stack ends exactly at the top edge of that chrome.

The bottom container announces its own resizes, so the anchor follows the chat input as it grows with a multi-line message and as the bottom panels come and go; terminal resizes re-anchor too. On a terminal too short to fit both, the offset is clamped so a toast is never pushed off screen. Modal screens compose their own rack and are deliberately left alone.

Worth a careful look: the anchoring math lives in _anchor_toast_rack, and _BottomChrome is a thin Container subclass that exists only to surface Resize (which does not bubble) to the app.

Screenshots

Test plan

• New pilot-driven tests cover the resting offset, that stacked toasts end flush above the chrome, that growing the chat input lifts the rack, and the short-terminal clamp. Three of the four fail without the change.

Made by Open SWE

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