feat(#5759): add composer focus shortcut

static/boot.js

@@ -2320,6 +2320,15 @@ document.addEventListener('keydown',async e=>{
       return;
     }
   }
+  // Cmd/Ctrl+Alt+/ focuses the message composer without creating a chat.
+  if((e.metaKey||e.ctrlKey)&&e.altKey&&!e.shiftKey&&(e.key==='/'||e.code==='Slash')){
+    const t=e.target;
+    const isText=t&&(t.tagName==='INPUT'||t.tagName==='TEXTAREA'||t.isContentEditable);
+    if(isText) return;
+    const composer=$('msg');
+    if(composer){e.preventDefault();composer.focus();}
+    return;
+  }
   // Enter on approval card = Allow once (when a button inside the card is focused or
   // card is visible and focus is not on an input/textarea/select)
   if(e.key==='Enter'&&!e.metaKey&&!e.ctrlKey&&!e.shiftKey){

tests/test_issue5759_composer_focus_shortcut.py

@@ -0,0 +1,74 @@
+"""Regression tests for #5759 composer focus shortcut."""
+
+from pathlib import Path
+
+
+BOOT_JS = (Path(__file__).parent.parent / "static" / "boot.js").read_text(encoding="utf-8")
+CHORD = "(e.metaKey||e.ctrlKey)&&e.altKey&&!e.shiftKey&&(e.key==='/'||e.code==='Slash')"
+CTRL_K = "(e.metaKey||e.ctrlKey)&&e.key==='k'"
+
+
+def _block_from(start: int) -> str:
+    depth = 0
+    end = start
+    for end in range(start, len(BOOT_JS)):
+        char = BOOT_JS[end]
+        if char == "{":
+            depth += 1
+        elif char == "}":
+            depth -= 1
+            if depth == 0:
+                return BOOT_JS[start : end + 1]
+    raise AssertionError("shortcut block not closed")
+
+
+def _composer_focus_branch() -> str:
+    start = BOOT_JS.index(CHORD)
+    return _block_from(start)
+
+
+def _ctrl_k_branch() -> str:
+    start = BOOT_JS.index(CTRL_K)
+    return _block_from(start)
+
+
+def test_composer_focus_chord_uses_alt_slash_and_stays_before_ctrl_k():
+    assert CHORD in BOOT_JS
+    assert "(e.metaKey||e.ctrlKey)&&e.key==='/'" not in BOOT_JS
+    assert "e.code==='Slash'" in BOOT_JS
+    assert BOOT_JS.index("(e.metaKey||e.ctrlKey)&&!e.shiftKey&&!e.altKey&&(e.key==='b'||e.key==='B')") < BOOT_JS.index(CHORD)
+    assert BOOT_JS.index(CHORD) < BOOT_JS.index(CTRL_K)
+
+
+def test_editable_targets_return_before_prevent_default():
+    branch = _composer_focus_branch()
+    guard = "const isText=t&&(t.tagName==='INPUT'||t.tagName==='TEXTAREA'||t.isContentEditable);"
+    assert "const t=e.target;" in branch
+    assert guard in branch
+    guard_idx = branch.index("if(isText) return;")
+    prevent_idx = branch.index("e.preventDefault();")
+    assert guard_idx < prevent_idx
+
+
+def test_composer_focus_branch_only_focuses_msg_and_does_not_mutate_session_state():
+    branch = _composer_focus_branch()
+    assert "const composer=$('msg');" in branch
+    assert "composer.focus();" in branch
+    assert "newSession()" not in branch
+    assert "renderSessionList()" not in branch
+    assert "closeMobileSidebar()" not in branch
+    assert "send()" not in branch
+    assert "clearDraft" not in branch
+    assert "draft" not in branch.lower()
+
+
+def test_mode_matrix_covers_focus_return_no_alt_and_unchanged_ctrl_k():
+    branch = _composer_focus_branch()
+    ctrl_k = _ctrl_k_branch()
+
+    assert "if(composer){e.preventDefault();composer.focus();}" in branch
+    assert "if(isText) return;" in branch
+    assert "(e.metaKey||e.ctrlKey)&&e.key==='/'" not in BOOT_JS
+
+    assert "if(_currentSessionIsReusableEmptyChat()){" in ctrl_k
+    assert "await newSession();await renderSessionList();closeMobileSidebar();$('msg').focus();" in ctrl_k