fix(web): make the empty workspace draggable on desktop

[otavio]

Fixes #13711.

Problem

On desktop, the "What should we work on?" screen (no projects yet) can't be used to move the window. On Windows and Linux the window uses a hidden title bar, so it can only be dragged where CSS sets -webkit-app-region: drag. Every workspace page gets that area from WorkspacePageHeader, but NoProjectsHero never rendered one. The only drag area left was the sidebar title row. Its wordmark is a link and can't be dragged, so only a few pixels of padding worked. With the sidebar collapsed, nothing could move the window.

The "Couldn't start a new thread" state in _chat.index.tsx had the same gap.

Fix

Both screens now render the shared WorkspacePageHeader in Electron, like the no-active-thread and hosted "connect a computer" empty states already do. That gives them the standard titlebar-height drag strip, with the usual collapsed-sidebar and native-controls insets. The header is empty and renders only in Electron, so the web layout is unchanged.

This replaces #6030, which targets the old inline hero and adds a separate spacer component instead of the shared header.

Verification

• vp lint on the changed files. The only warning is a pre-existing one in _chat.index.tsx code this PR doesn't touch.
• apps/web typecheck passes.
• I couldn't record a before/after video. The dev Electron build wouldn't start on my NixOS machine because it couldn't load libglib-2.0.so.0. To check it by hand: open the desktop app with no projects, collapse the sidebar, and drag from the top strip of the main pane.

Surfaces: desktop only. Web keeps its current layout (no window to drag), and mobile doesn't use these components. Providers, contracts, and docs are unaffected.

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Made with Claude Opus 5.5 in Claude Code (running in T3 Code).

Summary by CodeRabbit

• UI Improvements
  • Added the Electron title bar header to the empty-project screen and draft-start error page.

[macroscopeapp]

Approvability

Verdict: Approved at 694e64b

Macroscope's review found this PR approvable — This is a narrowly scoped, desktop-only fix that reuses the existing workspace header to restore window dragging in two empty states. It leaves browser behavior unchanged and introduces no schema, deployment, security, billing, or static-analysis changes.

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📥 Commits

Reviewing files that changed from the base of the PR and between ed809f7 and 694e64b.

📒 Files selected for processing (2)

• apps/web/src/components/NoProjectsHero.tsx
• apps/web/src/routes/_chat.index.tsx

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📝 Walkthrough

Walkthrough

The no-project hero and draft-start error state now conditionally show the workspace header in Electron. Other runtimes do not show the added header.

Changes

Electron workspace headers

Layer / File(s)	Summary
Add headers to empty and error states apps/web/src/components/NoProjectsHero.tsx, apps/web/src/routes/_chat.index.tsx	The no-project hero and draft-start error state render WorkspacePageHeader when running in Electron. Other runtimes omit the added header.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix · Severity of issue fixed: Low

Suggested reviewers: juliusmarminge

Merge Risk: ⚪ Minimal · up to 694e6

The empty-workspace and failed-draft screens gain the intended Electron drag area, with other runtimes unchanged. No actionable merge risk is identified beyond normal checks.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: enabling desktop dragging for the empty workspace.
Description check	✅ Passed	The description explains the problem, fix, affected surfaces, verification results, and verification limitation. It uses equivalent sections for the template’s required content, although it omits the …
Linked Issues check	✅ Passed	Issue #13711 requires window dragging from the empty-workspace area. The PR renders WorkspacePageHeader electron in NoProjectsHero for Electron. WorkspacePageHeader applies the drag-region cla…
Out of Scope Changes check	✅ Passed	The two changes add the Electron drag region to empty-workspace screens. They directly support issue #13711 and do not change project actions, draft behavior, or the non-Electron layout.

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