revert: tea 1.0 rewrite (#1122–#1126) (#1146)

Reverts #1126, #1125, #1124, #1123 and #1122.

`go.mod` keeps the Go 1.26 line with toolchain `go1.26.9` (instead of the original `go1.26.6`) so the security fix from #1131 isn't lost.

reopens #69
reopens #141
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reopens #1118

Reviewed-on: https://gitea.com/gitea/tea/pulls/1146
Reviewed-by: TheFox0x7 <95654+thefox0x7@noreply.gitea.com>

modules/utils/draft_test.go

@@ -0,0 +1,34 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package utils
+
+import "testing"
+
+func TestDraftPrefix(t *testing.T) {
+	cases := []struct {
+		in        string
+		has       bool
+		stripped  string
+		withDraft string
+	}{
+		{"plain title", false, "plain title", "WIP: plain title"},
+		{"WIP: already", true, "already", "WIP: already"},
+		{"wip: lowercase", true, "lowercase", "wip: lowercase"},
+		{"[WIP] bracketed", true, "bracketed", "[WIP] bracketed"},
+		{"[wip]  extra space", true, "extra space", "[wip]  extra space"},
+		{"Draft: not recognized", false, "Draft: not recognized", "WIP: Draft: not recognized"},
+		{"", false, "", "WIP: "},
+	}
+	for _, c := range cases {
+		if got := HasDraftPrefix(c.in); got != c.has {
+			t.Errorf("HasDraftPrefix(%q) = %v, want %v", c.in, got, c.has)
+		}
+		if got := StripDraftPrefix(c.in); got != c.stripped {
+			t.Errorf("StripDraftPrefix(%q) = %q, want %q", c.in, got, c.stripped)
+		}
+		if got := AddDraftPrefix(c.in); got != c.withDraft {
+			t.Errorf("AddDraftPrefix(%q) = %q, want %q", c.in, got, c.withDraft)
+		}
+	}
+}