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/projects/workspace-structure.ts

@@ -6,6 +6,7 @@ export interface WorkspaceStructureHostPlacement {
   projectId: string;
   iconWorkingDir: string;
   worktreeSupport: "supported" | "unsupported" | "unknown";
+  customIconRevision?: string | null;
 }
 
 export interface WorkspaceStructureProject {
@@ -158,6 +159,7 @@ function addProjectToView(input: {
     projectId: project.projectId,
     iconWorkingDir: project.projectRootPath,
     worktreeSupport: project.projectKind === "git" ? "supported" : "unsupported",
+    customIconRevision: project.projectCustomIconRevision,
   };
   const draft = byProject.get(viewKey);
   if (!draft) {