app: lift database edits out of IdaTui, and one prompt abstraction

Second cut at the 4000-line class, and the biggest: 702 contiguous lines of
rename/comment/retype/make-data/literal-format/define, now EditController.

What stays on IdaTui is what Textual insists on owning -- on_<Message> handlers,
which it dispatches by name on the DOMNode, and @work entry points, whose worker
machinery wants a DOMNode host. Both are one-line delegates.

Underneath them was the duplication that made this worth doing rather than just
moving lines. Opening a prompt (hide the status bar, set placeholder, can_focus,
display, value, focus) was written out five times; closing it four; and Esc was a
six-branch ladder in on_key with one copy of the same four lines per prompt. They
had drifted -- search cancelled its highlight, goto restored focus, the edit
prompts did neither consistently. Prompt/PromptBar own that discipline once, and
close() HANDS BACK the context it was holding, so it can't be read twice or go
stale: the listing's rename had to capture _rename_addr by hand before
_end_rename cleared it, or the name went to address 0.

_line_ea_for stays on the app -- rpc.py and the goto readback ask the same
question, so it was never an edit helper.

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