fix: compact watch-party participant layout

[chrisae9]

Summary

A narrow watch-party sidebar showed only three of six people because participant rows used several lines and the list had an artificial half-viewport cap. Compact each row to 52px with time and readiness on one line, reserve detailed drift/progress for Advanced controls, remove the empty viewer control row, and let the participant list share available space with chat.

Expand the local fixture to six people and add viewer/empty-chat scenarios. Include this feedback fix in the pending v6.4.11 release; live deployment remains held while WALL·E is playing.

Verification

• Lint, build, 171 Node tests, and 574 frontend tests passed.
• Added a regression check for the empty viewer control row.
• Rendered six-person viewer and host layouts; at 348×844, 540×844, and 540×640 all six rows fit. Viewer rows total 312px with no list or drawer overflow; chat and message input remain visible.
• Live Plex playback and physical-device interaction remain unverified for this change.

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📥 Commits

Reviewing files that changed from the base of the PR and between 440c9a9 and 256922e.

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📒 Files selected for processing (5)

• src/__tests__/sidebar-room-actions.test.js
• src/components/TheSidebarRight.vue
• src/components/UserList.vue
• test/fixtures/ui-preview.js
• test/fixtures/ui-preview.vue

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