feat(ui): wheel over sidebar switches agent or workspace

[qiansekai]

feat(ui): wheel over sidebar switches agent or workspace

Problem

Scroll wheel over the sidebar does not switch focus:

• Over the agent panel it does nothing when the list is short, and scrolls the list content when it overflows.
• Over the workspace list it only moves the highlight (move_selected_workspace_by_visible_delta) without switching the active workspace, so nothing visibly changes in the main area.

Change

• Reuse the existing cycle_agent_entry / next_workspace / previous_workspace logic (previously #[cfg(test)] only) for wheel input.
• In switch mode (default), wheel over the sidebar cycles focus, consistent with wheel-over-tab-bar: agent panel → focus next/prev agent; workspace area → switch next/prev active workspace. Wraps around.
• In scroll mode, the previous behavior (scroll list content / move highlight) is preserved.

Config

[ui.sidebar]
wheel = "switch"   # "switch" (default) | "scroll"

Tests

• wheel_over_agent_panel_switches_agent
• wheel_over_workspace_list_switches_workspace
• wheel_scroll_mode_preserves_scrolling

[kangal-bot]

Hi @qiansekai, thanks for your interest in contributing.

Herdr does not accept unsolicited implementation pull requests from contributors who are not listed in .github/APPROVED_CONTRIBUTORS.

The pull request author is not an approved contributor.

If you encountered a reproducible bug, report the observed behavior through the bug issue template. A report does not reserve the work or authorize a pull request; accepted fixes are normally implemented by Herdr’s maintainer-controlled agents.

Feature requests, behavior changes, and other proposals belong in GitHub Discussions. Do not open an issue merely to justify an implementation that was already written.

If a maintainer explicitly wants this implementation, they can reopen the pull request. Reopening by anyone else will be closed again automatically.

See https://github.com/herdrdev/herdr/blob/master/CONTRIBUTING.md for the contribution policy.

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