* feat(web-shell): Add sidebar customization API for branding, navigation, session actions, and footer
Add new sidebar configuration options to WebShellSidebarOptions:
- primaryNav.items: Control which built-in nav buttons are shown (newTask, plugins, scheduledTasks, goals)
- primaryNav.render(): Append custom content after built-in nav buttons
- hideProjectHeader: Hide the 'Projects' header row (search + add workspace)
- sessionActions.items: Control which session action items appear (both inline and dropdown)
- sessionActions.inlineItems: Control which items render as inline hover buttons (supports all action types with icon/text fallback)
- footer.render(): Inject custom UI elements on the left side of the footer
- Move scheduledTasks and goals from footer.items to primaryNav.items
Visibility follows a strict 'hide-first' policy: inline buttons require all three conditions (items includes + inlineItems includes + built-in capability check) to render.
* fix(web-shell): Prevent inline/dropdown duplication and add pin/archive dropdown fallback
- Critical fix 1: Dropdown items now exclude items already shown as inline buttons (added !inlineActionItems.has guard to each dropdown entry and trigger visibility).
- Critical fix 2: pin and archive now have dropdown menu entries as fallback when not configured as inline items, preventing them from becoming inaccessible.
- Narrowed inlineItems type to WebShellSidebarSessionInlineActionItem (excludes details/group which have no working inline handlers), preventing dead buttons.
- Added destructive color styling (var(--destructive)) to inline delete button when not disabled.
* fix(web-shell): Re-export new sidebar types and add visibility matrix tests
- Re-export WebShellSidebarPrimaryNavOptions, WebShellSidebarPrimaryNavItem, WebShellSidebarSessionActionsOptions, WebShellSidebarSessionActionItem, and WebShellSidebarSessionInlineActionItem from client/index.tsx so consumers can import them by name.
- Add session-action-visibility.test.ts: table-driven tests covering the items × inlineItems × capability matrix (default config, empty items/inlineItems, dedup guarantee, pin fallback to dropdown). 7 test cases, all pass.
* fix(web-shell): gate readOnly archive on sessionActionItems, fix footer null safety and docs accuracy (#7379)
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Co-authored-by: Qwen Code Bot <qwen-code-bot@users.noreply.github.com>
