fix(tui): let keypad Home and End move the prompt cursor

The session prompt binds `input.buffer.home` and `input.buffer.end` to
`none`, so NumPad Home and NumPad End (kitty `CSI 57423 u` / `CSI 57424 u`)
do nothing while the caret is in the prompt. Plain Home and End move the
caret, which makes the keypad keys look broken rather than unbound.

Bind the two commands to `kphome` and `kpend`. These are buffer commands,
not line commands: measured on a two-line prompt, plain Home lands at the
start of the buffer, so the keypad key has to land there too.

Author: argszero

packages/tui/src/config/keybind.ts

@@ -223,8 +223,8 @@ export const Definitions = {
   "input.visual.line.end": keybind("alt+e", "Move to end of visual line in input"),
   "input.select.visual.line.home": keybind("alt+shift+a", "Select to start of visual line in input"),
   "input.select.visual.line.end": keybind("alt+shift+e", "Select to end of visual line in input"),
-  "input.buffer.home": keybind("none", "Move to start of buffer in input"),
-  "input.buffer.end": keybind("none", "Move to end of buffer in input"),
+  "input.buffer.home": keybind("kphome", "Move to start of buffer in input"),
+  "input.buffer.end": keybind("kpend", "Move to end of buffer in input"),
   "input.select.buffer.home": keybind("shift+home", "Select to start of buffer in input"),
   "input.select.buffer.end": keybind("shift+end", "Select to end of buffer in input"),
   "input.delete.line": keybind("ctrl+shift+d", "Delete line in input"),

packages/tui/test/config-v2.test.tsx

@@ -167,8 +167,8 @@ test("preserves current navigation defaults", () => {
   expect(config.keybinds.get("session.message.previous")).toEqual([])
   expect(config.keybinds.get("session.message.user.next")).toEqual([])
   expect(config.keybinds.get("session.message.user.previous")).toEqual([])
-  expect(config.keybinds.get("input.buffer.home")).toEqual([])
-  expect(config.keybinds.get("input.buffer.end")).toEqual([])
+  expect(config.keybinds.get("input.buffer.home")).toMatchObject([{ key: "kphome" }])
+  expect(config.keybinds.get("input.buffer.end")).toMatchObject([{ key: "kpend" }])
   expect(config.keybinds.get("prompt.images.view")).toMatchObject([{ key: "<leader>i" }])
 })