feat: 提交详情能看 diff，也能丢给 AI 审这一次改动。文件检查可单独排除路径，TODO 只认大写，避免把 todo 表和模块当成待办标记。

热力图按容器宽度铺满一年，不再横向滚动。托盘右键换成可换皮肤的弹层；更新下载显示进度，退出后再由脚本拉起安装器，避免还占着 exe。

service/git_patch_test.go

@@ -0,0 +1,68 @@
+package service
+
+import (
+	"strings"
+	"testing"
+	"view/model"
+)
+
+func TestParseCommitPatches(t *testing.T) {
+	raw := `diff --git a/main.go b/main.go
+index 111..222 100644
+--- a/main.go
++++ b/main.go
+@@ -1,2 +1,3 @@
+ package main
++// feature
+`
+	got := parseCommitPatches(raw)
+	p, ok := got["main.go"]
+	if !ok || p.Binary || p.Text == "" {
+		t.Fatalf("patch=%#v", got)
+	}
+	if !strings.Contains(p.Text, "+// feature") {
+		t.Fatalf("missing added line: %q", p.Text)
+	}
+}
+
+func TestParseCommitPatchesBinaryAndDelete(t *testing.T) {
+	raw := `diff --git a/logo.png b/logo.png
+index 111..222 100644
+Binary files a/logo.png and b/logo.png differ
+diff --git a/gone.go b/gone.go
+deleted file mode 100644
+index 111..000
+--- a/gone.go
++++ /dev/null
+@@ -1 +0,0 @@
+-package gone
+`
+	got := parseCommitPatches(raw)
+	if !got["logo.png"].Binary {
+		t.Fatalf("binary not marked: %#v", got["logo.png"])
+	}
+	if got["gone.go"].Text == "" || got["gone.go"].Binary {
+		t.Fatalf("deleted file patch=%#v", got["gone.go"])
+	}
+}
+
+func TestFormatCommitDiffForAI(t *testing.T) {
+	d := model.GitCommitDetail{
+		GitCommit: model.GitCommit{Hash: "abc123", Author: "Ann", Email: "a@b.c", Date: "2026-08-19", Message: "add feature", Added: 2, Deleted: 1},
+		Files: []model.GitFileChange{
+			{Path: "main.go", Status: "modified", Added: 2, Deleted: 1, Patch: "+// feature\n-old"},
+			{Path: "logo.png", Status: "modified", Binary: true},
+		},
+	}
+	text := FormatCommitDiffForAI(d, 0)
+	if !strings.Contains(text, "add feature") || !strings.Contains(text, "main.go") || !strings.Contains(text, "+// feature") {
+		t.Fatalf("unexpected prompt:\n%s", text)
+	}
+	if !strings.Contains(text, "[binary]") {
+		t.Fatal("binary file should be listed")
+	}
+	tiny := FormatCommitDiffForAI(d, 80)
+	if !strings.Contains(tiny, "因过长未纳入") && !strings.Contains(tiny, "add feature") {
+		t.Fatalf("truncated prompt:\n%s", tiny)
+	}
+}