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.

.claude/settings.local.json

@@ -71,7 +71,9 @@
       "Bash(echo \"EXIT:$?\")",
       "Bash(ls target/)",
       "Bash(rustup target *)",
-      "Bash(echo \"exit code: $?\")"
+      "Bash(echo \"exit code: $?\")",
+      "Read(//home/cbr/.cargo/registry/src/**)",
+      "Bash(find / -maxdepth 6 -iname \"mistralrs-*\" -type d)"
     ]
   }
 }