refactor(commit-ai): remove local models and simplify AI flow

Remove local on-device model support and related IPC commands,
consolidating commit-generation to cloud providers and simplifying the
AI crate surface. Local-specific types, generation profiles, caching,
and the local prompt builder were removed while message sanitization and
diff-echo detection were preserved. Also harden repository handling and
runtime: unborn HEADs are handled gracefully so empty repos still report
files, Git LFS sync is skipped for repositories without commits, and
tokio runtime features were enabled.

- Remove local model engine, load/status commands, and local profile code
- Handle unborn HEAD and skip LFS sync for repos without commits
- Enable tokio runtime features and route AI generation to cloud only

src/lib/components/AiReviewDialog.svelte

@@ -15,8 +15,7 @@
   function providerLabel(value: CommitAiProvider): string {
     if (value === "openai") return "OpenAI";
     if (value === "anthropic") return "Anthropic";
-    if (value === "custom") return "Custom endpoint";
-    return "Local AI";
+    return "Custom endpoint";
   }
 
   function locationLabel(finding: AiReviewFinding): string {

src/lib/components/AiSettingsDialog.svelte

@@ -1,20 +1,18 @@
 <script lang="ts">
   import { onDestroy, onMount } from "svelte";
-  import { AlertCircle, Bot, Check, Cpu, Eye, EyeOff, Gauge, Globe, Key, LoaderCircle, Sparkles, X, Zap } from "@lucide/svelte";
+  import { Bot, Check, Eye, EyeOff, Globe, Key, LoaderCircle, X } from "@lucide/svelte";
   import { credDelete, credLoad, credSave } from "../git";
-  import type { AiSettings, CommitAiLocalProfile, CommitAiProvider, LocalModelOption } from "../types";
-  import SelectMenu from "./SelectMenu.svelte";
+  import type { AiSettings, CommitAiProvider } from "../types";
 
   interface Props {
     settings: AiSettings;
-    localModels: LocalModelOption[];
     onSave: (settings: AiSettings) => void;
     onClose: () => void;
   }
 
-  let { settings, localModels = [], onSave, onClose }: Props = $props();
+  let { settings, onSave, onClose }: Props = $props();
 
-  type CloudProvider = Exclude<CommitAiProvider, "local">;
+  type CloudProvider = CommitAiProvider;
 
   const CRED_KEYS: Record<CloudProvider, string> = {
     openai: "ai:openai",
@@ -22,9 +20,7 @@
     custom: "ai:custom",
   };
 
-  let provider = $state<CommitAiProvider>("local");
-  let localModelId = $state("");
-  let localProfile = $state<CommitAiLocalProfile>("fast");
+  let provider = $state<CommitAiProvider>("openai");
   let openaiModel = $state("");
   let anthropicModel = $state("");
   let customBaseUrl = $state("");
@@ -41,8 +37,6 @@
 
   $effect(() => {
     provider = settings.provider;
-    localModelId = settings.localModelId;
-    localProfile = settings.localProfile ?? "fast";
     openaiModel = settings.openaiModel;
     anthropicModel = settings.anthropicModel;
     customBaseUrl = settings.customBaseUrl;
@@ -103,8 +97,6 @@
       ]);
       onSave({
         provider,
-        localModelId,
-        localProfile,
         openaiModel: openaiModel.trim() || "gpt-4o-mini",
         anthropicModel: anthropicModel.trim() || "claude-3-5-haiku-latest",
         customBaseUrl: customBaseUrl.trim(),
@@ -117,26 +109,6 @@
     }
   }
 
-  function formatSize(mb: number): string {
-    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>
 
 <div
@@ -156,17 +128,6 @@
 
     <form class="ai-settings-form" onsubmit={(e) => { e.preventDefault(); void handleSave(); }}>
       <div class="ai-provider-options" role="radiogroup" aria-label="AI provider">
-        <button
-          type="button"
-          class="ai-provider-option ai-provider-option-local"
-          class:active={provider === "local"}
-          disabled
-          title="Local AI is still in development and not yet available"
-        >
-          <Cpu size={16} aria-hidden="true" />
-          Local AI
-          <span class="ai-provider-badge">In development</span>
-        </button>
         <button type="button" class="ai-provider-option" class:active={provider === "openai"} onclick={() => { provider = "openai"; }}>
           <Bot size={16} aria-hidden="true" />
           OpenAI
@@ -181,38 +142,7 @@
         </button>
       </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>
-          <SelectMenu value={localModelId} options={localModels.map((option) => ({ value: option.id, label: `${option.label} - ${formatSize(option.approx_size_mb)}` }))} onChange={(value) => { localModelId = value; }} />
-        </label>
-        <div class="cred-token-hint">
-          <AlertCircle size={13} aria-hidden="true" />
-          <span>
-            Switching downloads the model{selectedLocalModel ? ` (${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"}
+      {#if provider === "openai"}
         <label class="cred-field">
           <span class="cred-field-label">Model</span>
           <input type="text" bind:value={openaiModel} placeholder="gpt-4o-mini" autocomplete="off" spellcheck="false" />

src/lib/components/CommitPanel.svelte

@@ -1,6 +1,5 @@
 <script lang="ts">
   import { Check, GitCommitHorizontal, LoaderCircle, RotateCcw, Settings, ShieldCheck, Sparkles } from "@lucide/svelte";
-  import type { CommitAiPhase, CommitAiProvider } from "../types";
 
   interface Props {
     commitMessage: string;
@@ -10,8 +9,6 @@
     isBusy: boolean;
     operation: string;
     stagedCount: number;
-    commitAiProvider: CommitAiProvider;
-    commitAiPhase: CommitAiPhase;
     commitAiGenerating: boolean;
     commitAiReviewing: boolean;
     commitAiSplitting: boolean;
@@ -35,8 +32,6 @@
     isBusy = false,
     operation = "",
     stagedCount = 0,
-    commitAiProvider = "local",
-    commitAiPhase = "idle",
     commitAiGenerating = false,
     commitAiReviewing = false,
     commitAiSplitting = false,
@@ -57,23 +52,19 @@
     onCommit();
   }
 
-  function aiButtonTitle(provider: CommitAiProvider, phase: CommitAiPhase, staged: number): string {
+  function aiButtonTitle(staged: number): string {
     if (staged === 0) return "Stage changes first";
-    if (provider === "local" && phase === "loading") return "AI model is downloading/loading — this happens once";
-    if (provider === "local" && phase === "error") return "AI model failed to load — check AI settings";
     return "Generate commit message with AI from the staged diff";
   }
 
-  let localModelLoading = $derived(commitAiProvider === "local" && commitAiPhase === "loading");
   let canGenerate = $derived(
     hasRepository &&
     !isBusy &&
     !commitAiGenerating &&
     !commitAiReviewing &&
-    stagedCount > 0 &&
-    (commitAiProvider !== "local" || commitAiPhase === "ready"),
+    stagedCount > 0,
   );
-  let canReview = $derived(canGenerate && commitAiProvider !== "local");
+  let canReview = $derived(canGenerate);
   let canSplit = $derived(canReview && stagedCount > 1 && !commitAiSplitting);
 </script>
 
@@ -90,7 +81,7 @@
         type="button"
         onclick={onSplitStaged}
         disabled={!canSplit}
-        title={commitAiProvider === "local" ? "Commit splitting currently requires an API provider" : "Suggest logical commits for the staged files"}
+        title="Suggest logical commits for the staged files"
       >
         {#if commitAiSplitting}<LoaderCircle class="spin" size={14} aria-hidden="true" />{:else}<GitCommitHorizontal size={14} aria-hidden="true" />{/if}
         Split
@@ -100,7 +91,7 @@
         type="button"
         onclick={onReviewStaged}
         disabled={!canReview}
-        title={commitAiProvider === "local" ? "Pre-commit review currently requires an API provider" : stagedCount === 0 ? "Stage changes first" : "Review staged changes for bugs and risks"}
+        title={stagedCount === 0 ? "Stage changes first" : "Review staged changes for bugs and risks"}
       >
         {#if commitAiReviewing}<LoaderCircle class="spin" size={14} aria-hidden="true" />{:else}<ShieldCheck size={14} aria-hidden="true" />{/if}
         Review
@@ -110,9 +101,9 @@
         type="button"
         onclick={onGenerateCommitMessage}
         disabled={!canGenerate}
-        title={aiButtonTitle(commitAiProvider, commitAiPhase, stagedCount)}
+        title={aiButtonTitle(stagedCount)}
       >
-        {#if commitAiGenerating || localModelLoading}<LoaderCircle class="spin" size={14} aria-hidden="true" />{:else}<Sparkles size={14} aria-hidden="true" />{/if}
+        {#if commitAiGenerating}<LoaderCircle class="spin" size={14} aria-hidden="true" />{:else}<Sparkles size={14} aria-hidden="true" />{/if}
         Generate
       </button>
       <button class="commit-settings-button" type="button" onclick={onOpenAiSettings} disabled={isBusy} title="AI settings" aria-label="AI settings">