docs: add application screenshots and interactive gallery

- Captured clean, full-page screenshots of all major application views
- Added an interactive HTML slide deck gallery for previewing features
- Created a high-resolution mosaic and a smaller preview mosaic
- Generated a Python script to automate mosaic creation
- Updated README.md with prominent links to the gallery and screenshots
- Added accessibility attributes (role="button", tabindex="0") to calendar rows

Made-with: Cursor

docs/screenshots.md

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+# Plymouth Independent Weekly - Screenshots
+
+Here is a detailed look at the various screens and features of the application.
+
+## 1. Dashboard
+The main dashboard provides an overview of the scheduler status and the latest generated issue.
+![Dashboard](screenshots/01-dashboard.png)
+
+## 2. Articles
+The articles view lists all fetched articles and allows filtering by week and category.
+![Articles](screenshots/02-articles.png)
+
+## 3. Publish - Single Week
+The publish screen features a combined week selector. Here, a single week is selected.
+![Publish Single Week](screenshots/03-publish.png)
+
+## 4. Publish - Multi-Week Range
+The combined week selector also allows selecting a range of weeks to compile into a single issue.
+![Publish Multi-Week](screenshots/04-publish_multi_week.png)
+
+## 5. Publish - Single Article
+You can also choose to publish a single article as a standalone issue.
+![Publish Single Article](screenshots/05-publish_single_article.png)
+
+## 6. Issues Archive
+The issues archive lists all generated issues, allowing you to read, download, push to a library, or regenerate them.
+![Issues](screenshots/06-issues.png)
+
+## 7. Web Reader
+The built-in web reader provides a clean, distraction-free reading experience for generated issues.
+![Reader](screenshots/07-reader.png)
+
+## 8. Settings
+The settings screen allows you to configure the RSS feed, auto-publish schedule, and ePub cover dimensions.
+![Settings](screenshots/08-settings.png)