build(release): bump to 2026.8.5 and update UI icons

This release bumps version numbers to 2026.8.5 across all
manifests and docs and includes UI refinements. The
status panel now uses lucide folder icons for tree view
and folders, replacing the previous icons and CSS.

- Replace the tree view icon with lucide FolderTree in status panel
- Use Folder and FolderOpen icons for expanded/collapsed folders
- Bump version to 2026.8.5 in all manifests and changelog

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "Gitty",
-  "version": "2026.8.4",
+  "version": "2026.8.5",
   "identifier": "com.gitty",
   "build": {
     "beforeDevCommand": "npm run prepare:lfs && npm run dev",