Add commit-level actions, graph filtering, demo mode, and headless screenshot capture

[hoangsvit]

Motivation

• Expose common commit-level Git actions (checkout, branch from commit, tag, cherry-pick, revert, reset) to the UI so users can operate on commits directly.
• Improve commit graph UX by adding search/author/ref filters and visual tweaks for clarity.
• Provide a browser-friendly demo mode and CI-friendly headless screenshot capture to enable previewing the app without a Tauri desktop runtime.

Description

• Added new Tauri commands in src-tauri/src/commands/history.rs (checkout_commit, create_branch_from_commit, create_tag_from_commit, cherry_pick_commit, revert_commit, reset_to_commit) and registered them in src-tauri/src/lib.rs.
• Updated frontend services in src/services/gitService.ts to expose the new commands and implemented a demo-mode fallback so the app can run in a browser without Tauri by returning sample data; detection is via __TAURI_INTERNALS__.
• Enhanced the commit UI in src/components/history/CommitDetails.tsx to add buttons for Branch/Tag/Cherry-pick/Revert/Checkout and Reset actions that invoke the new service methods, with simple prompts/confirmation flows.
• Reworked the commit graph in src/components/graph/GitGraph.tsx to rebuild row logic, add search/author/ref filters, adjust spacing/colors, and improve row rendering and selection/dim behavior.
• Auto-open the most recent repository in src/App.tsx when not running under Tauri to make browser demo mode more convenient.
• Added demo fixtures in src/demo/currentRepoDemo.ts for demo-mode history/status/repo data.
• Replaced the previous virtual-display screenshot approach with a Chrome DevTools-based capture: added scripts/capture-screenshot.mjs and updated .github/workflows/ci.yml to run the Vite preview and capture a screenshot via headless Chrome, including timeouts and artifact upload, and updated the workflow summary text.

Testing

• Ran the repository CI workflow (.github/workflows/ci.yml) which performs the frontend build, starts a preview, and runs the headless Chrome screenshot capture; those steps completed in the pipeline run.
• Built the frontend (npm run build) and compiled Rust/Tauri bindings (cargo build) during CI and local verification to ensure new Tauri commands and TypeScript bindings compile.
• Exercised demo-mode in the browser (preview) to verify commit graph filtering, commit details actions UI, and screenshot capture using the new scripts/capture-screenshot.mjs script.

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