Persist thread sidebar state

[Mitch515]

What Changed

• persist thread-level sidebar metadata such as hidden state and dismissed sidebar keys
• add the contracts, server projection, persistence, migration, and web-state wiring needed to restore that sidebar state after reload
• apply default sidebar-state coverage in related web fixtures and tests

Why

• per-thread sidebar dismissal and hidden-state choices should survive reloads and reconnects
• restoring thread-specific sidebar state makes the UI more predictable during longer-running workflows

UI Changes

• screenshots are attached in the PR asset comment

Checklist

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

Note

Persist thread sidebar state across client and server

• Adds sidebarHiddenAt and dismissedSidebarKeys fields to the OrchestrationThread contract, client Thread type, and ProjectionThread persistence model
• Introduces a thread.sidebar-state.update command and thread.sidebar-state-updated event; the decider deduplicates dismissed keys and sets updatedAt
• Adds migration 016_ProjectionThreadsSidebarState.ts to add sidebar_hidden_at and dismissed_sidebar_keys_json columns to projection_threads via conditional PRAGMA-guarded ALTER TABLE
• The projection pipeline and in-memory projector apply sidebar state updates with deduplication; snapshots hydrate these fields by parsing the stored JSON array
• Client store (syncServerReadModel) maps both fields from the server read model into local thread state

^{Macroscope summarized bbaab2b.}

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[Mitch515]

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