Show Git attribution in the editor

[GordonBeeming]

Summary

• Add gix-backed file and line attribution with clickable commit details.
• Keep attribution visible while editing, including local unsaved and saved-uncommitted ghost text.
• Add date format settings plus exact dependency pins and Dependabot cooldowns.

Test plan

• ./run-tests.sh
• Visual check for status bar and editor attribution states

Closes #8

[gemini-code-assist]

Code Review

This pull request transitions the Git attribution service from shell-backed git commands to embedded gitoxide/gix APIs, and updates the frontend to display unsaved or uncommitted changes inline while keeping the last commit attribution visible. The review feedback focuses on performance and memory optimizations: replacing synchronous file I/O with asynchronous reads to prevent blocking the async executor thread, utilizing the Rust Entry API and reference mapping to eliminate redundant clones of GitCommitInfo, and flattening the nested dynamic programming tables in both Rust and TypeScript into contiguous 1D arrays to minimize heap allocations.

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[Copilot]

Pull request overview

This PR implements GitLens-style Git attribution in the IDE, including file-level “last commit” status bar info and line-level editor attribution that stays visible during edits (with special handling for unsaved and saved-but-uncommitted changes). It also migrates backend attribution to embedded gix and tightens dependency/version management with exact pins plus Dependabot scheduling.

Changes:

• Add uncommittedLines to the Git attribution API contract and normalize it in the frontend.
• Enhance the editor attribution UI to keep commit attribution during dirty edits and show local “unsaved/uncommitted” ghost attribution for affected lines.
• Replace shell-git attribution with gix blame/commit plumbing; add exact dependency pins and Dependabot config.

Reviewed changes

Copilot reviewed 11 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/tauri.ts	Extends Git attribution normalization to include uncommittedLines.
src/tauri.test.ts	Adds coverage for uncommittedLines normalization defaults/validation.
src/styles.css	Refines status bar layout and styles “dirty” attribution ghost text.
src/EditorPane.tsx	Adds dirty-aware attribution behavior and line mapping logic for edits.
src/EditorPane.test.tsx	Adds tests for dirty attribution behavior and uncommitted line rendering.
src/App.tsx	Keeps attribution active while editing and passes isDirty into the editor pane.
src/App.test.tsx	Adds test asserting status bar attribution remains visible while dirty.
src-tauri/src/git_attribution.rs	Switches attribution implementation to embedded gix, adds uncommitted line detection, updates tests.
src-tauri/Cargo.toml	Pins Rust deps exactly; adds gix + jiff constraints.
src-tauri/Cargo.lock	Updates lockfile for gix/jiff and pinned dependency graph.
package.json	Pins npm dependencies to exact versions (and bumps esbuild).
package-lock.json	Updates lockfile to match exact npm pins.
.github/dependabot.yml	Adds Dependabot config with weekly schedules and cooldown windows.

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