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>

.oxlintrc.json

@@ -130,7 +130,7 @@
         ]
       }
     },
-    // Raw query burn-down: 35 files total; the 29 files below still enforce the useUnistyles ban.
+    // Raw query burn-down: 34 files total; the 28 files below still enforce the useUnistyles ban.
     {
       "files": [
         "packages/app/src/assistant-file-links/use-file-link.ts",
@@ -154,10 +154,9 @@
         "packages/app/src/hooks/use-is-local-daemon.ts",
         "packages/app/src/hooks/use-keyboard-shortcut-overrides.ts",
         "packages/app/src/hooks/use-preferred-editor.ts",
-        "packages/app/src/hooks/use-project-icon-query.ts",
         "packages/app/src/hooks/use-settings/index.ts",
         "packages/app/src/panels/terminal-panel.tsx",
-        "packages/app/src/projects/project-icons.ts",
+        "packages/app/src/projects/icons.ts",
         "packages/app/src/provider-usage/use-provider-usage.ts",
         "packages/app/src/screens/project-settings-screen.tsx",
         "packages/app/src/screens/workspace/use-workspace-checkout-status.ts",