Put the document actions where the thumb is

[andiwand]

Stacked on #530.

The toolbar menu is gone. What can be done with the open document is now two buttons over its bottom right corner: search, which is what a reader reaches for most, and one that unfolds the other seven with their names next to them.

The top right corner of a modern phone is the one place a thumb holding it cannot reach, and it is where every one of these lived - four of them behind "More options", which says nothing about what is inside. Naming them costs a tap that the overflow charged anyway.

DocumentActions is a view rather than a menu, so the actions are set whenever a load finishes instead of whenever something happens to invalidate the menu. That is the reason for the odd rule the old code lived by: prepareMenu ran from onCreateMenu only, and a document that finished loading does not invalidate anything, so which items were visible depended on what else had asked the toolbar to rebuild. There is no menu provider left in either class, and menu_main.xml is deleted.

The rows scroll: seven of them do not fit above the buttons on a phone held sideways. They hide while an action mode is up - find, tts and edit each bring their own controls - and while fullscreen has the screen, which back still leaves exactly as before. Back folds them up first.

Checked on a Pixel 6 Pro emulator, portrait and landscape: unfolding, every icon, the scrim, back, the find action mode and fullscreen. All 20 instrumented tests pass.

🤖 Generated with Claude Code

https://claude.ai/code/session_01RxF8q9WCwGcu5AHr9yZber