fix(query): let the query bar keep Return instead of open_thread

Pressing Return in the query bar moved focus to the thread list and left
the query unrun, so a query typed at the keyboard could not be executed
at all.

Return is bound to open_thread as a Qt::WindowShortcut, and a shortcut is
dispatched before the focused widget ever sees the key. Qt withholds a
plain-LETTER shortcut from an editable widget, which is why every other
binding in the map was safe here, but Return is not a letter and gets no
such protection: the action fired from inside the bar, its handler called
setFocus() on the thread list, and QLineEdit::returnPressed was never
emitted.

Accept the ShortcutOverride for Return and Enter on the query bar, which
tells Qt the focused widget wants the key as ordinary input and stops the
shortcut being dispatched. Narrow by design, one widget and one key, so
open_thread keeps working everywhere else in the window.

Three earlier hypotheses were tested and disproven before this one, and
two synthetic probes wrongly reported the binding as harmless: real input
sends ShortcutOverride first and only dispatches the shortcut if nothing
claims it, while QTest::keyClick skips that round trip entirely. The new
test drives the override exchange rather than the keystroke and fails
against the old code. The comment claiming no filter was needed said the
letter rule covered this case; it did not, and it now says so.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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