feat: add Ctrl+N and Ctrl+F shortcuts

Ctrl+N starts a fresh conversation and puts the cursor in the input box.
Ctrl+F jumps to the search field.

The search field sits in the top bar, but its results render in the history
panel, so focusing it reveals a hidden panel rather than leaving the search
with nowhere to show its hits.

Escape now backs out of the search field before it hides the window: first
press clears the text, second returns to the input, third hides. Previously
a stray Escape while filtering dismissed the whole window.

That check reads focusWidget() rather than hasFocus(), so it still holds
when the window is not the active one.

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

0 files changed, 0 insertions, 0 deletions