README: replace ASCII mock with 4-theme screenshot grid (anthropic / instrument / editorial / retro)

README.md

@@ -4,24 +4,16 @@ A small always-on-top Windows desktop widget that shows your live Claude
 subscription usage — the same percentages Claude Code's `/usage` command
 displays, refreshed every 5 minutes.
 
-```
-┌─────── Claude Usage ────────────╳ ─┐
-│                                     │
-│         ╭───────╮                   │
-│        ╱   72%   ╲                  │
-│       │  session  │                 │
-│        ╲ resets  ╱                  │
-│         ╰ 2:50am ╯                  │
-│                                     │
-│   Models (current block)            │
-│   ▰▰▰▰▰▰▰▰▰▱▱▱▱▱▱▱                  │
-│   ● Opus 42M   ● Haiku 3M           │
-│                                     │
-│   Weekly limits     resets May 9    │
-│   All models    ▆░░░░░     8%       │
-│   Sonnet        ▃░░░░░     5%       │
-└─────────────────────────────────────┘
-```
+## Themes
+
+Pick one in Settings; it applies live. Each is its own typographic + chromatic system.
+
+| | |
+|---|---|
+| **Anthropic** — warm cream-on-charcoal, Newsreader serif + DM Sans, sunset-orange ring, soft radial halo. The default. | **Instrument** — modular-synth panel, JetBrains Mono, chartreuse on slate, tick marks at 12/3/6/9, faint scanlines, bracket corners on the title bar. |
+| ![Anthropic theme](docs/screenshots/anthropic.png) | ![Instrument theme](docs/screenshots/instrument.png) |
+| **Editorial** — magazine artifact, Fraunces variable serif (optical-size axis), saffron on warm charcoal, italic labels, hairline rules. | **Retro CRT** — 1980s home computer, IBM Plex Mono, phosphor green on near-black, scanlines + vignette, bracketed `[ Claude Usage ]` header, blink cursor in the corner. |
+| ![Editorial theme](docs/screenshots/editorial.png) | ![Retro CRT theme](docs/screenshots/retro.png) |
 
 ## Install