Add Bubble Tea TUI (cmd/tui) with three-pane layout

- Connects to a running daemon's IPC port on startup
- Sends join_network then get_state; listens for events in real time
- Three-pane layout: room list (left), message history (centre), peers (right)
- Tab/Shift+Tab to switch rooms, Enter to send, PgUp/PgDn to scroll
- DM rooms appear automatically when a DM arrives
- test-tui.sh boots the full stack (anchor + 3 peers) and opens the TUI
  as alice, with bob and charlie sending periodic messages as live noise
- README: layout diagram, key bindings, TUI section; roadmap item marked done

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

go.mod

@@ -7,13 +7,33 @@ require (
 	github.com/google/uuid v1.6.0
 	github.com/pion/webrtc/v3 v3.3.6
 	golang.org/x/crypto v0.24.0
+	modernc.org/sqlite v1.53.0
 	nhooyr.io/websocket v1.8.17
 )
 
 require (
+	github.com/atotto/clipboard v0.1.4 // indirect
+	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
+	github.com/charmbracelet/bubbles v1.0.0 // indirect
+	github.com/charmbracelet/bubbletea v1.3.10 // indirect
+	github.com/charmbracelet/colorprofile v0.4.1 // indirect
+	github.com/charmbracelet/lipgloss v1.1.0 // indirect
+	github.com/charmbracelet/x/ansi v0.11.6 // indirect
+	github.com/charmbracelet/x/cellbuf v0.0.15 // indirect
+	github.com/charmbracelet/x/term v0.2.2 // indirect
+	github.com/clipperhouse/displaywidth v0.9.0 // indirect
+	github.com/clipperhouse/stringish v0.1.1 // indirect
+	github.com/clipperhouse/uax29/v2 v2.5.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
+	github.com/lucasb-eyer/go-colorful v1.3.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-localereader v0.0.1 // indirect
+	github.com/mattn/go-runewidth v0.0.19 // indirect
+	github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6 // indirect
+	github.com/muesli/cancelreader v0.2.2 // indirect
+	github.com/muesli/termenv v0.16.0 // indirect
 	github.com/ncruces/go-strftime v1.0.0 // indirect
 	github.com/pion/datachannel v1.5.8 // indirect
 	github.com/pion/dtls/v2 v2.2.12 // indirect
@@ -32,13 +52,15 @@ require (
 	github.com/pion/turn/v2 v2.1.6 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/stretchr/testify v1.9.0 // indirect
 	github.com/wlynxg/anet v0.0.3 // indirect
+	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
 	golang.org/x/net v0.22.0 // indirect
 	golang.org/x/sys v0.44.0 // indirect
+	golang.org/x/text v0.16.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	modernc.org/libc v1.73.4 // indirect
 	modernc.org/mathutil v1.7.1 // indirect
 	modernc.org/memory v1.11.0 // indirect
-	modernc.org/sqlite v1.53.0 // indirect
 )