Add commit actions & graph filters; demo mode; Windows ICO; multi-OS CI artifacts

[hoangsvit]

Motivation

• Expose more commit-level operations (checkout, branch/tag from commit, cherry-pick, revert, reset) from the UI and backend to improve workflow ergonomics.
• Improve commit graph usability with search, author/ref filters and visual polish for easier history exploration.
• Provide a browser demo mode so the frontend can run without a Tauri backend for easier development and CI validation.
• Replace fragile screenshot-based CI with cross-platform desktop bundle builds and upload artifacts, and include a Windows ICO in the bundle.

Description

• CI: Reworked .github/workflows/ci.yml to a matrix build job for Linux/Windows/macOS, removed headless screenshot run, changed permissions to contents: read, and added artifact upload and PR comment/summarize steps that reference the uploaded bundles.
• Tauri/Rust: Updated src-tauri/build.rs to generate icons/icon.ico and ensure required PNG icons exist, and added the ICO to src-tauri/tauri.conf.json bundle icons.
• Backend commands: Added multiple 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.
• Frontend UI: Rewrote the commit graph (src/components/graph/GitGraph.tsx) to add search, author/ref filters, row highlighting/dimming and layout adjustments; replaced CommitDetails (src/components/history/CommitDetails.tsx) with a richer panel exposing branch/tag/cherry-pick/revert/checkout/reset actions.
• Demo mode & services: Added src/demo/currentRepoDemo.ts with sample repo/history/status and updated src/services/gitService.ts to use a demo RPC layer when not running inside Tauri, and to expose the new commit-related RPC calls.
• Misc: Small formatting cleanup in src/main.tsx, updated package-lock.json and added artifact naming/layout changes in CI.

Testing

• Ran local frontend dependency install and build with npm ci and npm run build, which completed successfully.
• Executed the Tauri check/build commands locally (npm run tauri:check and npm run tauri -- build) to validate the desktop bundle generation and new ICO inclusion, which succeeded in the local environment.
• CI workflow updated to perform matrix builds and artifact uploads; the workflow configuration was validated in the repository (no automated test failures from the config changes during the rollout).

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