Fix CI failures: server tests, app typecheck, workspace schema alignment

- Fix workspace test files to use file-backed registry schema (cwd/workspaceId
  instead of directory/numeric id)
- Remove DB-specific test setup (direct DB inserts) from snapshot-mutation test
- Fix worktree-session.ts: remove duplicate createAgentWorktree call, fix imports
- Fix daemon-client.test.ts and agent-manager.test.ts assertions
- Fix app typecheck: add `as any` casts for web-only backgroundImage CSS
- Fix session.workspace-git-watch.test.ts workspace shape
- Fix workspace-reconciliation-service.test.ts registry mocks

packages/app/src/components/workspace-hover-card.tsx

@@ -327,7 +327,7 @@ function WorkspaceHoverCardContent({
                             styles.externalLinkOverlay,
                             {
                               backgroundImage: `linear-gradient(to right, transparent, ${theme.colors.surface2} 40%)`,
-                            },
+                            } as any,
                           ]}
                         >
                           <ExternalLink size={12} color={theme.colors.foreground} />

packages/app/src/screens/workspace/workspace-scripts-button.tsx

@@ -184,7 +184,7 @@ export function WorkspaceScriptsButton({
                                 styles.externalLinkOverlay,
                                 {
                                   backgroundImage: `linear-gradient(to right, transparent, ${theme.colors.surface2} 40%)`,
-                                },
+                                } as any,
                               ]}
                             >
                               <ExternalLink size={12} color={theme.colors.foreground} />