feat(commit-ai): enhance commit message generation and caching

Improve the commit message generation process by adding a caching mechanism and refining the input handling. This change aims to enhance performance and prevent redundant computations when generating commit messages based on staged changes.

- **src-tauri/crates/commit_ai/src/cloud.rs**:
  - Introduced `looks_like_diff_echo` function to detect if the model's output is a diff instead of a commit message.
  - Updated `openai_compatible_request` and `generate_anthropic` to utilize the new function for error handling.

- **src-tauri/crates/commit_ai/src/lib.rs**:
  - Added `LocalGenerationProfile` enum for managing different generation profiles.
  - Implemented caching for generated messages to avoid redundant processing.
  - Updated `generate_commit_message` to incorporate caching logic.

- **src-tauri/src/git.rs**:
  - Added `staged_diff_local` function to handle local profile generation and exclude specific lock files from the diff.
  - Modified `commit_ai_generate` to accept and process the local generation profile.

- **src/App.svelte**:
  - Added `lastLocalAiGeneratedMessage` state to track the last generated message and prevent unnecessary updates.

- **.claude/settings.local.json**:
  - Updated settings to include additional commands for better functionality.

src/lib/types.ts

@@ -9,6 +9,7 @@ export type FileStatusKind =
 
 export type CommitAiPhase = "idle" | "loading" | "ready" | "error";
 export type CommitAiProvider = "local" | "openai" | "anthropic" | "custom";
+export type CommitAiLocalProfile = "fast" | "balanced" | "detailed";
 
 export interface CommitAiStatus {
   phase: CommitAiPhase;
@@ -25,6 +26,7 @@ export interface LocalModelOption {
 export interface AiSettings {
   provider: CommitAiProvider;
   localModelId: string;
+  localProfile: CommitAiLocalProfile;
   openaiModel: string;
   anthropicModel: string;
   customBaseUrl: string;