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/view_test.go

@@ -0,0 +1,103 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package terminal
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func issueView() View {
+	return View{
+		Title: "Login fails\x1b[2J", ID: "#1",
+		Badges: []Cell{{Text: "Open", Color: "green"}},
+		Meta:   "alice opened about 1 hour ago • 2 comments",
+		Fields: []Field{
+			{Label: "State", Value: "open", PipedOnly: true},
+			{Label: "Labels", Cells: []Cell{{Text: "bug", Color: "ee0701"}, {Text: "priority/high"}}},
+			{Label: "Milestone", Value: "v1.0"},
+			{Label: "Blocked by"},
+			{Label: "Comments", Value: "2", TTYOnly: true},
+		},
+		Body: "Steps:\r\n1. Use `p@ss!`\x1b]52;c;aGk=\x07\n",
+		Kind: "issue", URL: "http://localhost:3001/alice/project/issues/1",
+	}
+}
+
+func TestViewRender(t *testing.T) {
+	for _, tc := range []struct {
+		name string
+		view View
+		d    Display
+		want string
+	}{
+		{
+			"key and value lines when piped",
+			issueView(),
+			Display{Color: true},
+			"title:\tLogin fails[2J\nstate:\topen\nlabels:\tbug, priority/high\nmilestone:\tv1.0\nblocked by:\t\n" +
+				"url:\thttp://localhost:3001/alice/project/issues/1\n--\nSteps:\n1. Use `p@ss!`]52;c;aGk=\n",
+		},
+		{
+			"summary for people",
+			issueView(),
+			Display{TTY: true},
+			"Login fails[2J #1\nOpen • alice opened about 1 hour ago • 2 comments\n" +
+				"Labels:    bug, priority/high\nMilestone: v1.0\nComments:  2\n\n" +
+				"Steps:\n1. Use `p@ss!`]52;c;aGk=\n\nView this issue on Gitea: http://localhost:3001/alice/project/issues/1\n",
+		},
+		{
+			"styled for color terminals",
+			View{Title: "v1.0", Badges: []Cell{{Text: "Latest", Color: "green"}}, Fields: []Field{{Label: "Labels", Cells: []Cell{{Text: "bug", Color: "ee0701"}}}}, URL: "https://example.org/r"},
+			Display{TTY: true, Color: true, TrueColor: true},
+			"\x1b[1mv1.0\x1b[0m\n\x1b[32mLatest\x1b[0m\n\x1b[1mLabels:\x1b[0m \x1b[38;2;238;7;1mbug\x1b[0m\n\n" +
+				"\x1b[90mNo description provided\x1b[0m\n\n\x1b[90mView on Gitea: https://example.org/r\x1b[0m\n",
+		},
+		{
+			"minimal",
+			View{Title: "Home"},
+			Display{TTY: true},
+			"Home\n\nNo description provided\n",
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			require.Equal(t, tc.want, tc.view.Render(tc.d))
+		})
+	}
+}
+
+func TestViewRendersMarkdownOnlyWhenEnabled(t *testing.T) {
+	view := View{Title: "Docs", Body: "# Setup\n\nRun **tea** [now](https://example.org).\n\n- one\n- two"}
+	require.Contains(t, view.Render(Display{TTY: true}), "\n# Setup\n\nRun **tea** [now](https://example.org).\n")
+	require.Contains(t, view.Render(Display{Markdown: true}), "--\n# Setup\n\nRun **tea** [now](https://example.org).\n")
+
+	plain := view.Render(Display{TTY: true, Markdown: true, Width: 40})
+	require.Contains(t, plain, "\n  # Setup\n\n  Run **tea** now https://example.org.\n\n  • one\n  • two\n")
+	require.NotContains(t, plain, "\x1b")
+
+	colored := view.Render(Display{TTY: true, Markdown: true, Color: true})
+	require.Contains(t, colored, "Run \x1b[1mtea\x1b[m")
+	require.NotContains(t, colored, "\x1b]8;")
+	require.Contains(t, view.Render(Display{TTY: true, Markdown: true, Color: true, Links: true}), "\x1b]8;id=")
+}
+
+func TestMarkdownSanitizesServerText(t *testing.T) {
+	rendered := Markdown("Hello \x1b]0;PWNED\x07world\n\n`\x1b[2Jcode`", Display{Color: true, Links: true})
+	require.NotContains(t, rendered, "\x1b]0;")
+	require.NotContains(t, rendered, "\x1b[2J")
+	require.Contains(t, rendered, "]0;PWNEDworld")
+	for _, line := range strings.Split(Markdown(strings.Repeat("word ", 50), Display{Width: 40}), "\n") {
+		require.LessOrEqual(t, len(line), 40, line)
+		require.Equal(t, strings.TrimRight(line, " "), line)
+	}
+}
+
+func TestMarkdownEnabled(t *testing.T) {
+	require.True(t, MarkdownEnabled("auto", true))
+	require.True(t, MarkdownEnabled("", true))
+	require.False(t, MarkdownEnabled("raw", true))
+	require.False(t, MarkdownEnabled("auto", false))
+}