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

cmd/comments/body.go

@@ -0,0 +1,37 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package comments
+
+import "io"
+
+// resolveBody picks the comment body from the non-interactive sources, in
+// precedence order:
+//
+//  1. the positional argument (kept first for back-compat with the historical
+//     'tea comment <idx> "<body>"' shorthand),
+//  2. the -d/--description flag (mirrors the body flag on 'issue create',
+//     'issue edit' and 'pr create'),
+//  3. piped stdin.
+//
+// stdin is only read when stdinPiped is true (a non-TTY stdin, e.g. CI,
+// subshells or agent harnesses) and no body was supplied otherwise, so the
+// command never blocks reading an interactive terminal when a body is already
+// given. An empty result means the caller should fall back to the editor (when
+// interactive) or error out.
+func resolveBody(positional, description string, stdinPiped bool, stdin io.Reader) (string, error) {
+	if len(positional) != 0 {
+		return positional, nil
+	}
+	if len(description) != 0 {
+		return description, nil
+	}
+	if stdinPiped {
+		stdinBytes, err := io.ReadAll(stdin)
+		if err != nil {
+			return "", err
+		}
+		return string(stdinBytes), nil
+	}
+	return "", nil
+}