Release v0.5.0: README refresh

- Add code-viewer polish line to the feature list (pinned gutter sized to
  the widest number, line wrap, jump buttons, theme-aware scrollbars)
- Extend mobile preview links (editor, dark and light paste views)
- Clarify PALETTE_MAX_ITEM covers can items and file attachments
- Document PALETTE_DEFAULT_DARK in docker-compose.yml so the compose file
  really covers every env var

README.md

@@ -21,6 +21,7 @@ a web UI for sharing text and small files.
 - Cookie based saved pastes and settings
 - Five base themes (midnight, smooth, pastel-lavender, pastel-peach, pastel-cloud), each with a dark and light variant
 - Dark mode toggle in the topbar and settings, with a configurable default
+- Polished code viewer: line-number gutter sized to the widest number and pinned during horizontal scroll, optional line wrap, jump-to-top/bottom buttons, and theme-aware scrollbars
 
 ## Screenshots
 
@@ -30,7 +31,7 @@ a web UI for sharing text and small files.
 | ![Paste view in midnight (dark)](https://git.archfox.org/poslop/palette/wiki/raw/palette-previews%2Fdesktop-paste-midnight-dark.png) | ![Settings and theme picker](https://git.archfox.org/poslop/palette/wiki/raw/palette-previews%2Fdesktop-settings-themes.png) |
 | ![Public pastes list](https://git.archfox.org/poslop/palette/wiki/raw/palette-previews%2Fdesktop-public.png) | ![Editor at mobile width](https://git.archfox.org/poslop/palette/wiki/raw/palette-previews%2Fmobile-editor-new.png) |
 
-Mobile previews (375x812): [paste view](https://git.archfox.org/poslop/palette/wiki/raw/palette-previews%2Fmobile-paste-midnight-dark.png), [public list](https://git.archfox.org/poslop/palette/wiki/raw/palette-previews%2Fmobile-public.png), [settings](https://git.archfox.org/poslop/palette/wiki/raw/palette-previews%2Fmobile-settings.png).
+Mobile previews (375x812): [editor](https://git.archfox.org/poslop/palette/wiki/raw/palette-previews%2Fmobile-editor-new.png), [paste view (dark)](https://git.archfox.org/poslop/palette/wiki/raw/palette-previews%2Fmobile-paste-midnight-dark.png), [paste view (light)](https://git.archfox.org/poslop/palette/wiki/raw/palette-previews%2Fmobile-paste-pastel-peach-light.png), [public list](https://git.archfox.org/poslop/palette/wiki/raw/palette-previews%2Fmobile-public.png), [settings](https://git.archfox.org/poslop/palette/wiki/raw/palette-previews%2Fmobile-settings.png).
 
 ## Get Started
 
@@ -66,7 +67,7 @@ go build -o palette ./cmd/palette
 | `PALETTE_ADDR` | `:8080` | Listen address |
 | `PALETTE_DB` | `palette.db` | SQLite database path |
 | `PALETTE_MAX_TEXT` | `5242880` | Max paste size in bytes (5 MB) |
-| `PALETTE_MAX_ITEM` | `26214400` | Max can item size in bytes (25 MB) |
+| `PALETTE_MAX_ITEM` | `26214400` | Max can item / file attachment size in bytes (25 MB) |
 | `PALETTE_ADMIN_KEY` | generated | Admin key; if unset a 32-char hex key is generated and persisted to `<db-dir>/admin-key` (0600) |
 | `PALETTE_DEFAULT_DARK` | dark on | Default dark mode for new visitors. Set `false`, `0`, or `off` to default to light mode. Visitors who toggle dark mode keep their choice in their browser. |
 | `PALETTE_UNLOCK_SECRET` | random per start | HMAC secret for password-unlock cookies. Set a fixed value to keep unlock sessions across restarts or across replicas. |