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/components/AiSettingsDialog.svelte

@@ -1,8 +1,8 @@
 <script lang="ts">
   import { onMount } from "svelte";
-  import { AlertCircle, Bot, Check, Cpu, Eye, EyeOff, Globe, Key, LoaderCircle, X } from "@lucide/svelte";
+  import { AlertCircle, Bot, Check, Cpu, Eye, EyeOff, Gauge, Globe, Key, LoaderCircle, Sparkles, X, Zap } from "@lucide/svelte";
   import { credDelete, credLoad, credSave } from "../git";
-  import type { AiSettings, CommitAiProvider, LocalModelOption } from "../types";
+  import type { AiSettings, CommitAiLocalProfile, CommitAiProvider, LocalModelOption } from "../types";
 
   interface Props {
     settings: AiSettings;
@@ -23,6 +23,7 @@
 
   let provider = $state<CommitAiProvider>("local");
   let localModelId = $state("");
+  let localProfile = $state<CommitAiLocalProfile>("fast");
   let openaiModel = $state("");
   let anthropicModel = $state("");
   let customBaseUrl = $state("");
@@ -39,6 +40,7 @@
   $effect(() => {
     provider = settings.provider;
     localModelId = settings.localModelId;
+    localProfile = settings.localProfile ?? "fast";
     openaiModel = settings.openaiModel;
     anthropicModel = settings.anthropicModel;
     customBaseUrl = settings.customBaseUrl;
@@ -86,6 +88,7 @@
       onSave({
         provider,
         localModelId,
+        localProfile,
         openaiModel: openaiModel.trim() || "gpt-4o-mini",
         anthropicModel: anthropicModel.trim() || "claude-3-5-haiku-latest",
         customBaseUrl: customBaseUrl.trim(),
@@ -102,6 +105,21 @@
     return mb >= 1000 ? `${(mb / 1000).toFixed(1)} GB` : `${mb} MB`;
   }
 
+  function recommendedModelForProfile(profile: CommitAiLocalProfile): string {
+    if (profile === "balanced") return "qwen2.5-1.5b";
+    if (profile === "detailed") return "qwen2.5-3b";
+    return "qwen2.5-0.5b";
+  }
+
+  function selectLocalProfile(profile: CommitAiLocalProfile) {
+    const previousRecommended = recommendedModelForProfile(localProfile);
+    localProfile = profile;
+    const nextRecommended = recommendedModelForProfile(profile);
+    if (!localModelId || localModelId === previousRecommended) {
+      localModelId = nextRecommended;
+    }
+  }
+
   let selectedLocalModel = $derived(localModels.find((option) => option.id === localModelId));
 </script>
 
@@ -142,6 +160,23 @@
       </div>
 
       {#if provider === "local"}
+        <div class="cred-field">
+          <span class="cred-field-label">Local speed</span>
+          <div class="ai-local-profile-options" role="radiogroup" aria-label="Local AI speed">
+            <button type="button" class="ai-local-profile-option" class:active={localProfile === "fast"} onclick={() => selectLocalProfile("fast")}>
+              <Zap size={15} aria-hidden="true" />
+              Fast
+            </button>
+            <button type="button" class="ai-local-profile-option" class:active={localProfile === "balanced"} onclick={() => selectLocalProfile("balanced")}>
+              <Gauge size={15} aria-hidden="true" />
+              Balanced
+            </button>
+            <button type="button" class="ai-local-profile-option" class:active={localProfile === "detailed"} onclick={() => selectLocalProfile("detailed")}>
+              <Sparkles size={15} aria-hidden="true" />
+              Detailed
+            </button>
+          </div>
+        </div>
         <label class="cred-field">
           <span class="cred-field-label">Model</span>
           <select bind:value={localModelId}>
@@ -156,6 +191,7 @@
             Switching downloads the model{selectedLocalModel ? ` (${formatSize(selectedLocalModel.approx_size_mb)})` : ""}
             in the background — depending on your internet connection this can take several minutes.
             After that it stays cached locally and loads instantly on the next start.
+            The speed setting only changes Local AI; API providers keep their existing prompt.
           </span>
         </div>
       {:else if provider === "openai"}

src/lib/git.ts

@@ -1,6 +1,7 @@
 import { invoke } from "@tauri-apps/api/core";
 
 import type {
+  CommitAiLocalProfile,
   CommitAiProvider,
   CommitAiStatus,
   ConflictFile,
@@ -112,6 +113,7 @@ export function commitAiLocalModels(): Promise<LocalModelOption[]> {
 export interface CommitAiGenerateOptions {
   notes?: string;
   provider: CommitAiProvider;
+  localProfile?: CommitAiLocalProfile;
   model?: string;
   apiKey?: string;
   baseUrl?: string;
@@ -122,6 +124,7 @@ export function commitAiGenerate(path: string, options: CommitAiGenerateOptions)
     path,
     notes: options.notes,
     provider: options.provider,
+    localProfile: options.localProfile,
     model: options.model,
     apiKey: options.apiKey,
     baseUrl: options.baseUrl,

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;