Add commit actions & interactive commit graph, demo-mode frontend, and CI matrix/artifact changes

[hoangsvit]

Motivation

• Expose more commit-level Git operations to the UI and provide an improved, filterable commit graph for easier repository navigation.
• Support running the web frontend in demo mode when not in the Tauri runtime so the app can be previewed in the browser.
• Simplify and modernize the GitHub Actions workflow to produce platform artifacts (Linux/Windows/macOS) and remove fragile headless screenshot steps.

Description

• Backend: added several 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 so the frontend can invoke these operations.
• Frontend UI: refactored the commit graph component (src/components/graph/GitGraph.tsx) to compute lanes more compactly, add search/author/ref filters, show counts and clear actions, and dim non-matching rows; improved row rendering and styling.
• Commit details: rewrote src/components/history/CommitDetails.tsx to provide actionable buttons (Branch, Tag, Cherry-pick, Revert, Checkout, and Reset modes) and wired them to the new gitService methods.
• Demo mode: added a demo repository dataset (src/demo/currentRepoDemo.ts) and implemented a demo runtime path in src/services/gitService.ts that auto-switches when not running under Tauri, plus added new RPC wrappers for the newly added backend commands.
• UX and small fixes: make the web app auto-open the most recent repo in src/App.tsx when not running under Tauri, minor formatting change in src/main.tsx, and updated package lock entries.
• CI/workflow: replaced the previous single Linux build + screenshot flow with a matrix build job targeting ubuntu-latest, windows-latest, and macos-latest, changed permissions for contents to read, removed the headless screenshot capture and publishing steps, upload platform bundles under artifact names (gitpilot-linux, gitpilot-windows, gitpilot-macos), and added separate comment-artifacts and summarize-artifacts jobs to post artifact download instructions and a summary.

Testing

• No new automated unit tests were added to the repository.
• Verified frontend build locally by running npm run build which completed successfully and allowed manual verification of the UI in demo mode.
• The CI workflow was reworked to build platform bundles and upload artifacts; no automated CI test suite changes were introduced in this PR.

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