This PR adds shared bottom-pane selection-list for future `/plugins`
menu work and wires the existing `/plugins` menu into the new
list-rendering path without changing it to tabs yet. The main
user-visible effect is that the current plugin list now renders as a
denser single-line list with shared name-column sizing, while the tabbed
selection support remains available for follow-up PRs but is currently
unused in production menus.
- Add generic tabbed selection-list support to the bottom pane,
including per-tab headers/items and tab-aware list state
- Add single-line row rendering with ellipsis truncation for dense list
UIs
- Add shared name-column width support so descriptions align
consistently across rows
- Wire the current /plugins menu to the new single-line and shared
column-width behavior only
- Keep tabbed menu adoption deferred; no existing menu is switched to
tabs in this PR
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Co-authored-by: Codex <noreply@openai.com>
canvrno-oai
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