feat(tui): add cursor style configuration (#32295)

Co-authored-by: Aiden Cline <63023139+rekram1-node@users.noreply.github.com>

packages/web/src/content/docs/config.mdx

@@ -273,6 +273,10 @@ Use a dedicated `tui.json` (or `tui.jsonc`) file for TUI-specific settings.
     "enabled": true
   },
   "diff_style": "auto",
+  "cursor": {
+    "style": "block",
+    "blinking": true
+  },
   "mouse": true,
   "attention": {
     "enabled": true,
@@ -285,6 +289,8 @@ Use a dedicated `tui.json` (or `tui.jsonc`) file for TUI-specific settings.
 
 Use `OPENCODE_TUI_CONFIG` to point to a custom TUI config file.
 
+When `cursor.style` is `"default"`, the terminal default cursor is restored, so `cursor.blinking` has no effect.
+
 Set `attention.enabled` to turn on TUI desktop notifications and sounds. See [TUI attention](/docs/tui#attention).
 
 Legacy `theme`, `keybinds`, and `tui` keys in `opencode.json` are deprecated and automatically migrated when possible.

packages/web/src/content/docs/tui.mdx

@@ -369,6 +369,10 @@ You can customize TUI behavior through `tui.json` (or `tui.jsonc`).
     "enabled": false
   },
   "diff_style": "auto",
+  "cursor": {
+    "style": "block",
+    "blinking": true
+  },
   "mouse": true,
   "attention": {
     "enabled": true,
@@ -395,6 +399,7 @@ This is separate from `opencode.json`, which configures server/runtime behavior.
 - `scroll_acceleration.enabled` - Enable macOS-style scroll acceleration for smooth, natural scrolling. When enabled, scroll speed increases with rapid scrolling gestures and stays precise for slower movements. **This setting takes precedence over `scroll_speed` and overrides it when enabled.**
 - `scroll_speed` - Controls how fast the TUI scrolls when using scroll commands (minimum: `0.001`, supports decimal values). Defaults to `3`. **Note: This is ignored if `scroll_acceleration.enabled` is set to `true`.**
 - `diff_style` - Controls diff rendering. `"auto"` adapts to terminal width, `"stacked"` always shows a single-column layout.
+- `cursor` - Controls the terminal cursor in TUI input fields. `style` defaults to `"block"`, can be `"underline"`, `"line"`, or `"default"`; `blinking` defaults to `true`. When `style` is `"default"`, the terminal default cursor is restored, so `blinking` has no effect.
 - `mouse` - Enable or disable mouse capture in the TUI (default: `true`). When disabled, the terminal's native mouse selection/scrolling behavior is preserved.
 - `attention` - Configures TUI desktop notifications and sounds. Disabled by default.