Implements a read-only repository viewer for remote Gitea repos and local clones. Adds UI/CSS for viewer panels, breadcrumb/branch controls, file table, code/Markdown preview, and readme rendering (frontend/css/components.css, frontend/js/app.js). Extends app state and wiring (state.js, app.js) with viewer actions, branch/content loading, local/remote navigation, and preview helpers (base64 decoding, markdown rendering, syntax highlighting, 256 KB preview limit). Adds Gitea API helpers to fetch repo branches and contents (frontend/js/gitea-api.js) and Tauri JS bindings for local repo operations (tauri-api.js). Implements Rust backend commands to list branches, tree entries, and file contents (with size/binary checks and helper utilities) and wires them into the Tauri command registry (src-tauri/src/lib.rs). Also updates README to mention the new read-only viewer.
Enhance UI and dev workflow: add main/right tabbed panels (Repositories/Local and Clone/Settings/Servers), repository owner filter pills (All/Personal/Organizations), org-grouped listing, repo cards, git output and empty-state styling. Introduce new state vars (activeMainTab, activeRightTab, repoOwnerFilter, currentUserLogin) and update event bindings to toggle tabs/filters and focus appropriate panels on actions. Add fetchCurrentUser to gitea-api and use it when loading repositories to distinguish personal vs organization repos (falls back to mock user on error). Update README with development/prerequisites and build instructions and rename npm script "tauri:dev" -> "dev" for running the Tauri dev process.
andrew