feat(plugin): multi-line text input via ui.input-multiline (#1968)

* feat(plugin): multi-line text input via ui.input-multiline

Adds host::input_multiline: a multi-line text dialog pre-filled with a
value, dismissed to none, confirmed with Cmd/Ctrl+Enter. Same rules as
input (command or event of a window, no capability, wait not charged).

Prompt::Input gains a multiline flag the frontend renders as a
textarea; the jobs fixture, SDK (wasm + mock), WIT and the plugin API
table are updated, and all plugin wasms rebuilt.

Fixes #1946

* chore: regenerate bindings after merging detail-provider rename

plugins/official/string-tools/dist/plugin.wasm.sources

@@ -1 +1 @@
-737d1a1eb063a6757e93f0359fc32ab2b624ef8c251a4cba31aa3c36f7587002
+fc3b11c7b09f9a57c319af579efdd6f00d9ed51dccc6e86404c5164c6460d007