feat: add host-local custom project icons (#2335)

* feat(projects): add local icons and colors

* refactor(projects): simplify appearance handling

* fix(projects): serialize appearance saves

* test(app): update project appearance expectations

* test: fix project appearance CI expectations

* refactor(projects): organize appearance code

* fix(server): adopt main's reconcile model in project appearance updates

* fix(projects): preserve host-local appearance targets

* fix(desktop): restore Linux development startup

Ubuntu can block Electron's unprivileged user-namespace fallback while the npm-installed sandbox helper is not SUID. Disable the Chromium process sandbox only in the Linux development runner so packaged desktop policy remains unchanged.

* feat(projects): add custom project icons

Keep URL acquisition in the client so the host daemon only validates uploaded bytes. Project name and icon changes share one adaptive edit sheet.

* refactor(settings): scope projects by host

---------

Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

packages/app/src/stores/session-store-hooks/selectors.test.ts

@@ -56,6 +56,7 @@ function projectDescriptorFromTestWorkspace(workspace: WorkspaceDescriptor): Pro
     projectKey: workspace.projectId,
     projectDisplayName: workspace.projectDisplayName,
     projectCustomName: workspace.projectCustomName ?? null,
+    projectCustomIconRevision: workspace.projectCustomIconRevision ?? null,
     projectRootPath: workspace.projectRootPath,
     projectKind: workspace.projectKind,
   };
@@ -348,6 +349,7 @@ describe("workspace structure composition", () => {
       projectKey: "project-a",
       projectDisplayName: "Project A",
       projectCustomName: null,
+      projectCustomIconRevision: null,
       projectRootPath: "/repo/a",
       projectKind: "git",
     };