feat: fit list tables to the terminal and write TSV when piped

Lists had no header, wrapped every row once a title was longer than
the terminal, and were space-padded when piped, so cut -f and awk -F'\t'
could not split them and empty cells collapsed.

terminal.Table now takes column specs and a Display. On a terminal it
prints an uppercase header, aligns columns two spaces apart and shrinks
flexible columns, widest first, to Streams.Width (the terminal, then
$COLUMNS, then 80), cutting by display width with "…". States use the
terminal's ANSI 16 colors, hex colors fall back to the 256-color palette
unless COLORTERM advertises 24-bit, and OSC 8 links appear only on the
first column, independently of color (TEA_HYPERLINKS=auto|always|never).
Piped tables are tab-separated without header, color or links, and times
are RFC3339 UTC instead of "about 2 hours ago".

terminal.View lays out single resources (title, badges, metadata, fields,
body, footer URL) and renders markdown bodies with glamour on a terminal
only (TEA_MARKDOWN=raw keeps them raw). Shared formatters cover relative
times, timestamps, sizes, durations and status icons.

In the app, writeTable and writeView are the new list and view writers:
a "Showing N of M …" context line, an empty-state message on stderr and
the next-page hint. writeList, writeItem and batch keep working and now
render through the new table: tab-separated when piped, truncated at the
widest column on a terminal, with headers for issue list and pr list.

Signed-off-by: bircni <bircni@icloud.com>

internal/terminal/markdown.go

@@ -0,0 +1,54 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package terminal
+
+import (
+	"regexp"
+	"strings"
+
+	"charm.land/glamour/v2"
+	"charm.land/glamour/v2/styles"
+)
+
+// MarkdownEnabled resolves the markdown preference: raw never renders, and auto renders on TTY stdout.
+func MarkdownEnabled(preference string, outTTY bool) bool {
+	return outTTY && preference != "raw"
+}
+
+// glamourLinks matches the OSC 8 hyperlinks that glamour writes for markdown links.
+var glamourLinks = regexp.MustCompile("\x1b\\]8;[^\x07\x1b]*(?:\x07|\x1b\\\\)")
+
+// Markdown renders sanitized markdown for d: wrapped to its width (80 when unknown), colored or plain,
+// with links only when d allows them. It keeps line breaks like Gitea does, and returns the sanitized
+// text unrendered if rendering fails.
+func Markdown(text string, d Display) string {
+	text = SafeText(text)
+	width := d.Width
+	if width <= 0 {
+		width = 80
+	}
+	style := styles.NoTTYStyleConfig
+	if d.Color {
+		style = styles.DarkStyleConfig
+		// The terminal's own text color keeps body text readable on light backgrounds too.
+		style.Document.Color = nil
+	}
+	renderer, err := glamour.NewTermRenderer(glamour.WithStyles(style), glamour.WithWordWrap(width), glamour.WithPreservedNewLines())
+	if err != nil {
+		return text
+	}
+	rendered, err := renderer.Render(text)
+	if err != nil {
+		return text
+	}
+	if !d.Links {
+		rendered = glamourLinks.ReplaceAllString(rendered, "")
+	}
+	// glamour pads every line to the full width.
+	lines := strings.Split(rendered, "\n")
+	for i, line := range lines {
+		lines[i] = strings.TrimRight(line, " ")
+	}
+	return strings.Trim(strings.Join(lines, "\n"), "\n")
+}