feat: build v1 Mews client: reader UI, gestures, Drift store, fetch actor

SPEC.md

@@ -18,7 +18,7 @@ A Flutter browser/client for Mews Pages (see mews-spec).
 
 ## Approach
 
-Local-first: all data is stored locally in a Drift database. Network operations (Nostr publishing, image upload) are secondary and never block local functionality.
+Local-first: all data is stored locally in a Drift database. Network operations are secondary and never block local functionality.
 
 # Architecture directives
 
@@ -55,4 +55,13 @@ Use the `actors` package only where Dart Isolate isolation is genuinely useful:
 ## Persistence — Drift
 
 - Use `drift` for all tables, DAOs, and queries.
-- Keep database definitions in `database/` separate from UI code.
+- Keep database definitions in `database/` separate from UI code.
+
+## v1 reader UI
+
+The v1 client presents one reader screen:
+
+- An address field pinned at the top; it hides when the reader scrolls down and returns when they scroll up or reach the top.
+- A swipe right goes back and a swipe left goes forward through the history stack.
+- Scrolling a page fades in a FOB in the bottom-right corner; on pages that fit without scrolling it is present from the start. It opens a bottom sheet with the reader's presentation choices: typeface, text size, theme (light, dark, follow system), color variant (site, warm, cool, green, mono), and a bookmark and subscription toggle for the current page.
+- Fonts are bundled. v1 ships Atkinson Hyperlegible; Verdana and Georgia follow once their font files are added to `app/assets/fonts/`. A font is one TTF plus one `fonts` entry in `app/pubspec.yaml` and one entry in `app/lib/presentation/reader/reader_fonts.dart`.