Fix workspace home model count submenus showing for every model on open

[johnny4dev]

Summary

Fix workspace home model count submenus showing for every model on open.

While fixing that, this also cleans up the worktree model menu layout so long model names remain readable and no longer collide with the instance count affordance on the right.

Details

In worktree mode, each model row has a nested submenu for selecting the number of runs. The submenu should stay hidden until the user hovers or focuses the corresponding model row.

This change updates the menu styling so:

• nested count submenus stay hidden by default
• the submenu appears only for the active hovered/focused row
• the dropdown can expand to fit full model names
• the right-side 1x and chevron keep dedicated spacing without overlapping labels

Screenshots

Before:

After:

Scope

• CSS-only change
• limited to src/styles/workspace-home.css

Validation

• npm run typecheck
• npm run test

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[chatgpt-codex-connector]

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Reviewed commit: ad136592a6

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