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/App.svelte

@@ -141,6 +141,7 @@
   let activeFileHistoryRequestId = "";
   let lastFileHistoryHeadHash = "";
   let commitMessage = "";
+  let lastLocalAiGeneratedMessage = "";
   let commitAiPhase: CommitAiPhase = "idle";
   let commitAiGenerating = false;
   let commitAiPollTimer: ReturnType<typeof setInterval> | undefined;
@@ -322,6 +323,13 @@
     startCommitAiPolling();
   }
 
+  function updateCommitMessage(message: string) {
+    commitMessage = message;
+    if (message !== lastLocalAiGeneratedMessage) {
+      lastLocalAiGeneratedMessage = "";
+    }
+  }
+
   async function generateCommitMessageWithAi() {
     if (!activeRepoPath || commitAiGenerating) return;
     if (aiSettings.provider === "local" && commitAiPhase !== "ready") return;
@@ -330,7 +338,13 @@
     try {
       const notes = commitMessage.trim() || undefined;
       if (aiSettings.provider === "local") {
-        commitMessage = await commitAiGenerate(activeRepoPath, { provider: "local", notes });
+        const localNotes = notes && notes !== lastLocalAiGeneratedMessage ? notes : undefined;
+        commitMessage = await commitAiGenerate(activeRepoPath, {
+          provider: "local",
+          notes: localNotes,
+          localProfile: aiSettings.localProfile,
+        });
+        lastLocalAiGeneratedMessage = commitMessage;
       } else if (aiSettings.provider === "openai") {
         const cred = await credLoad("ai:openai");
         commitMessage = await commitAiGenerate(activeRepoPath, {
@@ -339,6 +353,7 @@
           model: aiSettings.openaiModel,
           apiKey: cred?.password,
         });
+        lastLocalAiGeneratedMessage = "";
       } else if (aiSettings.provider === "anthropic") {
         const cred = await credLoad("ai:anthropic");
         commitMessage = await commitAiGenerate(activeRepoPath, {
@@ -347,6 +362,7 @@
           model: aiSettings.anthropicModel,
           apiKey: cred?.password,
         });
+        lastLocalAiGeneratedMessage = "";
       } else {
         const cred = await credLoad("ai:custom");
         commitMessage = await commitAiGenerate(activeRepoPath, {
@@ -356,6 +372,7 @@
           baseUrl: aiSettings.customBaseUrl,
           apiKey: cred?.password,
         });
+        lastLocalAiGeneratedMessage = "";
       }
     } catch (error) {
       errorMessage = errorToMessage(error);
@@ -527,7 +544,8 @@
   function defaultAiSettings(): AiSettings {
     return {
       provider: "local",
-      localModelId: "qwen2.5-1.5b",
+      localModelId: "qwen2.5-0.5b",
+      localProfile: "fast",
       openaiModel: "gpt-4o-mini",
       anthropicModel: "claude-3-5-haiku-latest",
       customBaseUrl: "",
@@ -1339,6 +1357,7 @@
     await runOperation("Committing", async () => {
       applyStatus(await commit(activeRepoPath, message));
       commitMessage = "";
+      lastLocalAiGeneratedMessage = "";
       await refreshBranchList(activeRepoPath);
       await refreshCommitHistory(activeRepoPath);
       await refreshExplorerFiles(activeRepoPath);
@@ -1968,7 +1987,7 @@
             {commitAiPhase}
             {commitAiGenerating}
             onCommit={commitChanges}
-            onCommitMessageChange={(msg) => { commitMessage = msg; }}
+            onCommitMessageChange={updateCommitMessage}
             onGenerateCommitMessage={generateCommitMessageWithAi}
             onOpenAiSettings={() => { aiSettingsOpen = true; }}
           />