fix: display all project directories in sidebar and toolbar

[wesbillman]

Overview

Category: fix
User Impact: Projects with multiple directories now correctly display all folders in the sidebar context panel and toolbar, instead of only showing the first one.

Problem: When users added multiple directories to a project via the create/edit dialog, only the first directory appeared in the context panel sidebar and the project selector dropdown — making it look like the other directories were lost.

Solution: Changed the ProjectOption type from a singular workingDir to a workingDirs array and updated all consuming components to render the full list.

File changes

src/features/chat/ui/ChatInput.tsx
Changed ProjectOption.workingDir?: string | null to workingDirs: string[] so the type accurately represents multiple directories.

src/features/chat/ui/ChatView.tsx
Pass the full workingDirs array instead of only workingDirs[0] when building availableProjects, and pass the array to ContextPanel.

src/features/chat/ui/ChatInputToolbar.tsx
Updated the project selector tooltip and dropdown descriptions to join all directories with commas instead of showing only the first.

src/features/chat/ui/ContextPanel.tsx
Changed prop from projectWorkingDir: string | null to projectWorkingDirs: string[]. Renders a "Folder:" line for each directory. Git status still uses the first directory since it's per-repo.

src/features/home/ui/HomeScreen.tsx
Updated the project-to-ProjectOption mapping to pass workingDirs array instead of workingDir.

src/features/chat/ui/tests/ChatInput.test.tsx
Updated test fixtures to use the new workingDirs array shape.

src/features/chat/ui/tests/ContextPanel.test.tsx
Updated test fixtures to use the new projectWorkingDirs prop.

Reproduction Steps

1. Create or edit a project and add 2+ directories via the "Add directories" button
2. Open a chat assigned to that project
3. In the right sidebar context panel under "Workspace", verify all directories appear as separate "Folder:" lines
4. In the chat toolbar, hover over the project selector — the tooltip should list all directories comma-separated
5. Click the project selector dropdown — each project's description should list all its directories

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