fix(keyboard): add CMD+Left/Right to default keybindings

Add CMD+Left (goLineStart) and CMD+Right (goLineEnd) to Chat context defaults. These are now officially discoverable and overrideable by users, rather than relying solely on hardcoded fallthrough logic.

Author: jhult

src-rust/crates/core/src/keybindings.rs

@@ -167,6 +167,8 @@ pub fn default_bindings() -> Vec<ParsedBinding> {
         ("ctrl+j", "newline", KeyContext::Chat),
         ("home", "goLineStart", KeyContext::Chat),
         ("end", "goLineEnd", KeyContext::Chat),
+        ("cmd+left", "goLineStart", KeyContext::Chat),
+        ("cmd+right", "goLineEnd", KeyContext::Chat),
 
         // Text Editing (Emacs-style) + app shortcuts
         ("ctrl+a", "openModelPicker", KeyContext::Chat),

src-rust/crates/tui/src/app.rs

@@ -4093,15 +4093,19 @@ impl App {
                 self.refresh_prompt_input();
             }
             KeyCode::Left => {
-                if key.modifiers.contains(KeyModifiers::CONTROL) {
+                if key.modifiers.contains(KeyModifiers::SUPER) {
+                    self.prompt_input.cursor = 0;
+                } else if key.modifiers.contains(KeyModifiers::CONTROL) {
                     self.prompt_input.move_word_backward();
                 } else {
                     self.prompt_input.move_left();
                 }
                 self.sync_legacy_prompt_fields();
             }
             KeyCode::Right => {
-                if key.modifiers.contains(KeyModifiers::CONTROL) {
+                if key.modifiers.contains(KeyModifiers::SUPER) {
+                    self.prompt_input.cursor = self.prompt_input.text.len();
+                } else if key.modifiers.contains(KeyModifiers::CONTROL) {
                     self.prompt_input.move_word_forward();
                 } else {
                     self.prompt_input.move_right();