feat: bind vim-style line-by-line scrolling (#8980)

Co-authored-by: Aiden Cline <aidenpcline@gmail.com>

packages/opencode/src/cli/cmd/tui/event.ts

@@ -16,6 +16,8 @@ export const TuiEvent = {
           "session.compact",
           "session.page.up",
           "session.page.down",
+          "session.line.up",
+          "session.line.down",
           "session.half.page.up",
           "session.half.page.down",
           "session.first",

packages/opencode/src/cli/cmd/tui/routes/session/index.tsx

@@ -601,6 +601,28 @@ export function Session() {
         dialog.clear()
       },
     },
+    {
+      title: "Line up",
+      value: "session.line.up",
+      keybind: "messages_line_up",
+      category: "Session",
+      disabled: true,
+      onSelect: (dialog) => {
+        scroll.scrollBy(-1)
+        dialog.clear()
+      },
+    },
+    {
+      title: "Line down",
+      value: "session.line.down",
+      keybind: "messages_line_down",
+      category: "Session",
+      disabled: true,
+      onSelect: (dialog) => {
+        scroll.scrollBy(1)
+        dialog.clear()
+      },
+    },
     {
       title: "Half page up",
       value: "session.half.page.up",