Add favourites feature with filtering and toggle functionality

[Copilot]

Overview

This PR implements a complete favourites feature for Deepr, allowing users to mark links as favourites and filter them separately. This addresses #[issue_number] which requested adding favourites functionality to the app.

Changes Made

Database Layer

• Added isFavourite column to the Deepr table (INTEGER, default 0)
• Implemented toggleFavourite SQL query to toggle favourite status using a CASE statement
• Implemented setFavourite SQL query for explicit favourite status setting
• Updated getLinksAndTags query to include the isFavourite field and support filtering by favourite status
• Created migration file 4.sqm to ensure smooth upgrades for existing users

ViewModel Layer

• Added favouriteFilter StateFlow to track the current filter state (-1 = All, 1 = Favourites)
• Implemented setFavouriteFilter(filter: Int) method to update the filter
• Implemented toggleFavourite(id: Long) method to toggle favourite status
• Enhanced the accounts query to combine favourite filtering with existing search, sort, and tag filters

UI Layer

• Home Screen: Added FilterChip tabs below the search bar displaying "All" and "Favourites" options
• DeeprItem: Added a new dropdown menu item to toggle favourite status
  • Shows "Add to favourites" with Star icon when not marked as favourite
  • Shows "Remove from favourites" with StarFilled icon when marked as favourite
  • Menu item position: after "Show QR Code" and before "Edit"

Localization

• Added three new string resources: favourites, add_to_favourites, and remove_from_favourites

How It Works

Users can now:

1. Tap the three-dot menu on any link and select "Add to favourites" to mark it
2. Use the "All" and "Favourites" tabs below the search bar to filter their links
3. Remove links from favourites via the same menu option (which dynamically changes to "Remove from favourites")

The favourite status persists across app restarts and integrates seamlessly with existing search, sort, and tag filtering capabilities.

Technical Details

• Filtering happens at the SQL level for optimal performance
• The implementation uses -1 to indicate "show all" in the SQL WHERE clause: ? = -1 OR Deepr.isFavourite = ?
• UI updates reactively through StateFlow when favourite status changes
• The feature is fully backward compatible with existing data through the migration file

Files Changed

• app/src/main/sqldelight/com/yogeshpaliyal/deepr/Deepr.sq - Schema and queries
• app/src/main/sqldelight/migrations/4.sqm - Database migration (new file)
• app/src/main/java/com/yogeshpaliyal/deepr/viewmodel/AccountViewModel.kt - Filter logic
• app/src/main/java/com/yogeshpaliyal/deepr/ui/screens/home/Home.kt - Filter tabs UI
• app/src/main/java/com/yogeshpaliyal/deepr/ui/screens/home/DeeprItem.kt - Toggle menu item
• app/src/main/res/values/strings.xml - String resources

Total Changes: +111 lines, -7 lines across 6 files

Testing Notes

The implementation follows all existing architectural patterns in the codebase. Manual testing should verify:

• Marking/unmarking links as favourites
• Filtering between All and Favourites tabs
• Persistence across app restarts
• Interaction with existing search and tag filters
• Database migration from version 3 to 4

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• dl.google.com
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.xml/javax.xml.namespace=ALL-UNNAMED -Xmx2048m -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-8.13-bin/5xuhj0ry160q40clulazy9h7d/gradle-8.13/lib/gradle-daemon-main-8.13.jar -javaagent:/home/REDACTED/.gradle/wrapper/dists/gradle-8.13-bin/5xuhj0ry160q40clulazy9h7d/gradle-8.13/lib/agents/gradle-instrumentation-agent-8.13.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 8.13 (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add favourites</issue_title>
<issue_description>- Add a tab for All/Favourites on top below search bar.

• Add column of is favourite in Deepr Table.
• Add Option in to add and remove favourites.</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #170

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