feat: independently toggle sidebar spaces/agents sections

[ahmad9059]

Summary

The sidebar's "spaces" and "agents" sections are always shown together today. This adds a visible flag to each so they can be toggled independently, with the other section expanding to fill the freed height.

[ui.sidebar.spaces]
visible = false   # default: true

[ui.sidebar.agents]
visible = false   # default: true

• Hiding spaces drops its header, workspace list, and "new"/"menu" footer; the agents section's divider line above the "agents" label is also removed, but the label and sort ("grouped") toggle still render — only the divider goes away.
• Hiding agents drops that section entirely and spaces expands to fill the height.
• Hiding both collapses the sidebar to zero width, matching sidebar_collapsed_mode = "hidden". This is separate from the manual prefix+b collapse toggle, which still works independently.
• Default is true for both, so existing configs are unaffected.

Test plan

• Focused sidebar test suite: 140 passed, 0 failed, including new regression coverage for:
  • divider hidden but agents header/toggle still rendering with spaces hidden
  • header still rendering (nonzero panel size) with zero agents and spaces hidden
  • height split when either section is hidden
  • sidebar collapsing to zero width when both are hidden
• compute_view and config:: test filters also green (3 and 149 passed) around the layout/config edits.
• cargo build --release --locked succeeds; --version, --help, and --default-config (both new visible blocks documented) verified manually.

Screenshots to follow.

[kangal-bot]

Hi @ahmad9059, 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.

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