fix(web): show Waiting for blocked chats

[IskanVa]

What Changed

Show Waiting in the sidebar when a thread is blocked on unresolved structured user input, not just permission approvals.

This change:

• adds shared thread-status derivation in session-logic
• updates the sidebar to distinguish blocked threads from actively running threads
• adds unit coverage for status precedence
• adds a browser regression test for the sidebar state

Why

Before this change, a thread could still appear as Working in the sidebar even when the agent had already stopped and was waiting for the user to answer a structured prompt.

That made the sidebar status misleading and made it harder to notice that the next action was required from the user.

UI Changes

Before:

• blocked-on-user-input threads still appeared as Working

After:

• blocked-on-user-input threads appear as Waiting

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for the UI change
• I included a video for animation/interaction changes

Note

Display a 'Waiting' status pill for blocked threads in the web Sidebar and add awaiting-response snapshot support in ChatView.browser.tsx

Introduce deriveThreadStatusState to drive Sidebar pills, mapping 'awaiting-response' to 'Waiting'; refactor Sidebar to use the derived status; add an awaiting-response orchestration snapshot and tests in apps/web/src/components/ChatView.browser.tsx and apps/web/src/session-logic.test.ts; implement status derivation in apps/web/src/session-logic.ts.

📍Where to Start

Start with deriveThreadStatusState in apps/web/src/session-logic.ts, then review its use in Sidebar via threadStatusPill in apps/web/src/components/Sidebar.tsx.

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[lblclass]

@copilot what the code using for?

[binbandit]

LGTM

[maria-rcks]

#701