fix(ui): open sessions directly without paused interstitial

[luokerenx4]

Change

Opening a paused Session previously landed on a decorative terminal and a second Resume step, while sidebar occupancy checks could disagree with that page. Remove ResumeCta and its CSS; opening a visible idle Session now activates its saved TUI/Web surface directly.

The activation hook checks Session Directory background occupancy before launching and exposes startup errors with explicit retry. One automatic attempt per mount avoids polling retry loops; hidden Workspace tabs do not activate, and an already-connected surface is not automatically reclaimed after disconnect. Missing Session routes display an error. Workspace Manager uses the same activation presentation, and cancelled interactive confirmation now reports cancellation.

Validation

• UI owner suite: 321 files, 1,886 tests passed.
• Final Manager/activation checks: 16 tests passed; UI TypeScript build passed.
• Browser desktop and 390px viewport: controlled 409 response shows the concrete error and Retry, with exactly one activation attempt and no paused interstitial.
• Real local backend: created a temporary Shell Session, paused it, opened its route, verified successful resume and running/terminal state, then deleted the test Session.
• Original Windows installation and native Pi incident were not reproduced; this verifies the frontend opening contract, not the original backend stale-record cause.

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Project	Deployment	Actions	Updated
openalice-demo	Ready	Preview	Sep 10, 2026 5:13pm UTC