fix(tui): make Home/End keys move cursor in input box (#1246)

Previously, Home/End without modifiers scrolled the transcript
instead of moving the cursor to the start/end of the input line.
This is unexpected for most users who expect standard text editing
behavior.

Now:
- Home/End (no modifier) → move cursor to start/end of input
- Ctrl+Home/End → scroll transcript to top/bottom

Closes #1234

Generated with [Claude Code](https://claude.ai/code)
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Co-authored-by: heloanc <heloanc@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Happy <yesreply@happy.engineering>

crates/tui/src/tui/keybindings.rs

@@ -99,7 +99,7 @@ pub const KEYBINDINGS: &[KeybindingEntry] = &[
         section: KeybindingSection::Navigation,
     },
     KeybindingEntry {
-        chord: "Home / End",
+        chord: "Ctrl+Home / Ctrl+End",
         description_id: crate::localization::MessageId::KbJumpTopBottom,
         section: KeybindingSection::Navigation,
     },
@@ -119,6 +119,11 @@ pub const KEYBINDINGS: &[KeybindingEntry] = &[
         description_id: crate::localization::MessageId::KbMoveCursor,
         section: KeybindingSection::Editing,
     },
+    KeybindingEntry {
+        chord: "Home / End",
+        description_id: crate::localization::MessageId::KbJumpLineStartEnd,
+        section: KeybindingSection::Editing,
+    },
     KeybindingEntry {
         chord: "Ctrl+A / Ctrl+E",
         description_id: crate::localization::MessageId::KbJumpLineStartEnd,

crates/tui/src/tui/ui.rs

@@ -2705,14 +2705,14 @@ async fn run_event_loop(
                 KeyCode::Right => {
                     app.move_cursor_right();
                 }
-                KeyCode::Home if key.modifiers.is_empty() => {
+                KeyCode::Home if key.modifiers.contains(KeyModifiers::CONTROL) => {
                     if let Some(anchor) =
                         TranscriptScroll::anchor_for(app.viewport.transcript_cache.line_meta(), 0)
                     {
                         app.viewport.transcript_scroll = anchor;
                     }
                 }
-                KeyCode::End if key.modifiers.is_empty() => {
+                KeyCode::End if key.modifiers.contains(KeyModifiers::CONTROL) => {
                     app.scroll_to_bottom();
                 }
                 KeyCode::Home | KeyCode::Char('a')
@@ -2720,6 +2720,9 @@ async fn run_event_loop(
                 {
                     app.move_cursor_start();
                 }
+                KeyCode::Home => {
+                    app.move_cursor_start();
+                }
                 KeyCode::End => {
                     app.move_cursor_end();
                 }