Feat/tui browse (#1266)

* Add interactive TUI browser command using Bubbletea v2

Adds `awesome-docker browse` to interactively explore the curated list
in a terminal UI with a category tree (left panel) and detailed resource
view (right panel). Enriches health_cache.yaml with category and
description fields so the cache is self-contained for the TUI.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Add TUI pagination, scrolloff, and fix visual overflow

Add pagination keybindings (Ctrl+D/PgDn, Ctrl+U/PgUp, g/Home, G/End)
to both tree and list panels. Implement scrolloff (4 lines) to keep
context visible around the cursor. Fix list panel overflow caused by
Unicode characters (★, ⑂) rendering wider than lipgloss measures,
which pushed the footer off-screen. Improve selection highlight
visibility with background colors.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

internal/tui/tui.go

@@ -0,0 +1,14 @@
+package tui
+
+import (
+	tea "charm.land/bubbletea/v2"
+	"github.com/veggiemonk/awesome-docker/internal/cache"
+)
+
+// Run launches the TUI browser. It blocks until the user quits.
+func Run(entries []cache.HealthEntry) error {
+	m := New(entries)
+	p := tea.NewProgram(m)
+	_, err := p.Run()
+	return err
+}