feat: added collapse side bar feature

[JKFerland]

Summary

• Persisted left sidebar collapse (narrow strip + expand chevron) alongside existing width resize; state in localStorage with width transition disabled while drag-resizing.
• Animations: width easing + stacked crossfade/slide hints on collapse/expand; respects prefers-reduced-motion.
• Workspace list: removed per-workspace “fold sessions only” chevron; sessions stay visible under each workspace.
• Collapse control lives in the same action strip as workspace + / ⋯ (selected row), with fallback row when selection is missing; session + settings sidebars wired the same via onToggleSidebarCollapse.

Why

• Collapsing only inner session lists wasted space without gaining a wider main surface; collapsing the whole rail matches user expectation and frees room for chat/session UI.
• Aligning the chevron with existing row controls keeps chrome consistent with the workspace row pattern and reduces visual noise.

Issue

• Closes [Feature]: Have Collapse Side Bar grant more screen real estate #1620

Scope

• apps/app/src/react-app/shell/workspace-shell-layout.ts — leftSidebarCollapsed, effectiveLeftSidebarWidth, toggleLeftSidebar, leftSidebarResizeActive, WORKSPACE_LEFT_SIDEBAR_WIDTH_TRANSITION, persisted keys.
• apps/app/src/react-app/domains/session/chat/session-page.tsx — aside layout, animations, passes onToggleSidebarCollapse.
• apps/app/src/react-app/domains/session/sidebar/workspace-session-list.tsx — optional onToggleSidebarCollapse; inline control on selected workspace row + fallback strip.
• apps/app/src/react-app/domains/settings/shell/settings-shell.tsx + apps/app/src/react-app/shell/settings-route.tsx — same collapse/animation contract and list prop wiring.

Out of scope

• OpenCode/engine APIs (pure client shell + layout persistence).
• Right-hand panels / todos / main session surface behavior beyond flex reflow when the rail narrows.

Testing

Ran

• pnpm dev

Result

• pass/fail: pass
• if fail, exact files/errors: N/A

CI status

• pass: N/A
• code-related failures: N/A
• external/env/auth blockers: N/A

Manual verification

• Open and close side bar

Evidence

Screen.Recording.2026-04-29.at.8.36.04.PM.mov

Risk

• Low simple UI change

Rollback

• Revert the PR

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Project	Deployment	Actions	Updated (UTC)
openwork-landing	Ready	Preview, Comment, Open in v0	Apr 30, 2026 3:37am

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[github-actions]

The following comment was made by an LLM, it may be inaccurate:

[src-opn]

Sorry, not really a fan of this implementation. forces the user to expand the bar when changing session/workspace
we have a designer onboard now, will see what they come up with.
thanks for the effort though