win11 terminate gitui SHIFT keymap doesn't work

**Describe the bug**
win11 terminate gitui SHIFT keymap doesn't work

**To Reproduce**
win11 terminate powershell7.4 SHIFT doesn't work
1. Go to open terminate
2. Execution guiti
3. for expamle: switch Log[2] tab, input SHFIT+F to search Files ,but gitui has No response. I is trying to switch IME(input method),However result is the same，beside I am quite sure that my hotkeys do not conflict.

**Expected behavior**
gitui can return to work , or gitui can develop the command pane function, users can input command to finish their work,
like vscode , keymap can defined Ctrl+Shift+p

**Screenshots**

**Context (please complete the following information):**
- OS/Distro + Version: win11
- GitUI Version 0.25.1
- Rust version: 1.75.0

**Additional context**
I hope you can help me solve this problem. Thank you

No source file, test, or entry point is named in the report. First reproduce the missing Shift+F response in Windows 11 PowerShell 7.4 with gitui 0.25.1, then trace the terminal key handling; done requires an agreed fix for the keymap behavior or a clearly scoped command-pane alternative.

Written by the indexing model from the issue text.