Add Vim style navigation to Menu, Clipboard, Emoji & Image-Picker

[Kylar514]

What

Adds control-modified vim navigation keys alongside the existing arrow-key handling in four launcher surfaces:

Panel	New keys
Menu	Ctrl+J/K select, Ctrl+L activate (like Right), Ctrl+H back (like Left, same empty-filter guard)
Clipboard	Ctrl+J/K move selection
Emojis	Ctrl+J/K row jumps, Ctrl+H/L within-row steps
Image picker	Ctrl+H/L previous/next image

All new branches are gated on Qt.ControlModifier, so unmodified letters continue to reach each panel's search filter exactly as before. Existing arrow/PageUp/Home/End behavior is untouched.

Testing

• test/shell.d/menu-test.sh, clipboard-test.sh, emojis-test.sh,
  image-picker-test.sh pass, including seven new assertions covering every
  added branch
• Manually exercised against the running shell: navigation in all four
  panels, filter typing unaffected, dmenu mode intact

[Copilot]

Pull request overview

Adds Ctrl-modified Vim navigation to four Quickshell launcher surfaces while preserving existing filtering and keyboard behavior.

Changes:

• Adds Ctrl+H/J/K/L navigation to applicable panels.
• Extends shell tests with seven shortcut assertions.
• Retains existing arrow-key and search handling.

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Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
shell/plugins/menu/Menu.qml	Adds Vim-style selection, activation, and back navigation.
shell/plugins/clipboard/Clipboard.qml	Adds Ctrl+J/K selection navigation.
shell/plugins/emojis/Emojis.qml	Adds Vim-style grid navigation.
shell/plugins/image-picker/ImagePicker.qml	Adds Ctrl+H/L carousel navigation.
test/shell.d/menu-test.sh	Covers menu shortcuts.
test/shell.d/clipboard-test.sh	Covers clipboard shortcuts.
test/shell.d/emojis-test.sh	Covers emoji shortcuts.
test/shell.d/image-picker-test.sh	Covers image-picker shortcuts.

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