[FEATURE] Add more keyboard shortcuts for navigating in all Panes

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Currently there are keyboardshortcuts to open the additional Panels (File, Diff, Terminal, ...) but there is no way to navigate within the panels via keyboard only. As a developer I am used avoid using the mouse for efficiency but claude code desktop forces me to slow down and use the mouse.

Proposed Solution

• in the file dialog I'd like to switch between filter textfield and file list
• When I moved the focus into the file list via mouse I can press Enter to open a file, but there is no way to edit it (I need mouse again)
• In the Diff there are three areas (commits, changed files, changed text). I found no keyboard shortcut to switch between them or open/close the diff-file-list
• In the terminal panel there is no shortcut to add terminals / switch between them
• scroll in the main panel (with the output of the model) up/down
• sometimes I want a panel to show more (aka make it bigger). there are no shortcuts for resizing
• ...

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

Developer tools/SDK

Use Case Example

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Additional Context

_No response_