feat: make boards drawer width adaptive by screen class

DESIGN.md

@@ -149,7 +149,7 @@ Kanbn4Droid is an unofficial app to connect to and manipulate data stored in sel
 
 **Settings view**
 - The view is available from a side panel that can be shown in the Boards list view by pulling in from the left side of the screen.
-  - The side panel only occupies up to a third of the screen.
+  - On smaller screens the side panel occupies full width; on larger screens it occupies up to two-thirds of the screen, capped by a max width.
   - The view behind the side panel dims when the side panel is open.
   - The side panel shows the following content from top to bottom:
     - Username as a title in bold text of the currently active user obtained with the "users/me" endpoint of the Kan.bn API.
@@ -169,7 +169,7 @@ Kanbn4Droid is an unofficial app to connect to and manipulate data stored in sel
 - All settings are managed using the AndroidX Preferences library.
 - Changing any settings makes it apply instantly when leaving the settings view without logging out.
 - Current status: implemented through a left-side drawer in `BoardsActivity` plus an in-place settings dialog (`SettingsDialogFragment` + `SettingsPreferencesFragment`) using AndroidX Preferences.
-  - Drawer behavior is implemented with `DrawerLayout`: left-edge gesture + toolbar open action, dimmed background, and runtime width capped to one-third of screen width.
+  - Drawer behavior is implemented with `DrawerLayout`: left-edge gesture + toolbar open action, dimmed background, and adaptive runtime width (small screens: full width; large screens: min(two-thirds of window, max width cap)).
   - Drawer content is implemented with profile header (`users/me`), workspaces list with active highlight, settings entry, retry/error states, and logout action with confirmation.
   - Workspace switching is implemented with active-workspace persistence and boards refresh; switch failures restore previous selection and unauthorized responses force sign-out.
   - Settings dialog implements Theme/Base URL/API key drafts, save-and-close apply flow, immediate theme application, credential re-auth on URL/key changes, and safe rollback on apply failure.

app/src/androidTest/java/space/hackenslacker/kanbn4droid/app/BoardsFlowTest.kt

@@ -281,7 +281,7 @@ class BoardsFlowTest {
     }
 
     @Test
-    fun drawerWidthNeverExceedsOneThirdOfScreen() {
+    fun drawerWidthIsAdaptiveForSmallAndLargeScreens() {
         MainActivity.dependencies.apiClientFactory = {
             FakeBoardsApiClient(
                 boards = mutableListOf(BoardSummary("1", "Alpha")),
@@ -292,9 +292,19 @@ class BoardsFlowTest {
         val scenario = ActivityScenario.launch(BoardsActivity::class.java)
 
         scenario.onActivity { activity ->
+            val drawerLayout = activity.findViewById<DrawerLayout>(R.id.boardsDrawerLayout)
             val drawerContent = activity.findViewById<View>(R.id.boardsDrawerContent)
-            val displayWidthPx = activity.resources.displayMetrics.widthPixels
-            assertTrue(drawerContent.layoutParams.width <= displayWidthPx / 3)
+            val resources = activity.resources
+            val breakpointSwDp = resources.getInteger(R.integer.boards_drawer_tablet_breakpoint_sw_dp)
+            val maxWidthPx = resources.getDimensionPixelSize(R.dimen.boards_drawer_max_width)
+            val isSmallScreen = resources.configuration.smallestScreenWidthDp < breakpointSwDp
+            val expectedWidth = if (isSmallScreen) {
+                drawerLayout.width
+            } else {
+                minOf((drawerLayout.width * 2) / 3, maxWidthPx)
+            }
+
+            assertEquals(expectedWidth, drawerContent.layoutParams.width)
         }
     }
 

app/src/main/java/space/hackenslacker/kanbn4droid/app/BoardsActivity.kt

@@ -13,6 +13,7 @@ import androidx.activity.viewModels
 import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.view.GravityCompat
+import androidx.core.view.doOnLayout
 import androidx.drawerlayout.widget.DrawerLayout
 import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.LinearLayoutManager
@@ -40,6 +41,7 @@ import space.hackenslacker.kanbn4droid.app.boards.BoardsRepository
 import space.hackenslacker.kanbn4droid.app.boards.BoardsUiEvent
 import space.hackenslacker.kanbn4droid.app.boards.BoardsUiState
 import space.hackenslacker.kanbn4droid.app.boards.BoardsViewModel
+import space.hackenslacker.kanbn4droid.app.boards.BoardsDrawerWidthCalculator
 import space.hackenslacker.kanbn4droid.app.boards.DrawerDataErrorCode
 import space.hackenslacker.kanbn4droid.app.boarddetail.BoardDetailActivity
 import space.hackenslacker.kanbn4droid.app.settings.SettingsDialogFragment
@@ -284,13 +286,20 @@ class BoardsActivity : AppCompatActivity() {
     }
 
     private fun applyDrawerWidth() {
+        drawerLayout.doOnLayout {
             val maxWidthPx = resources.getDimensionPixelSize(R.dimen.boards_drawer_max_width)
-        val displayWidthPx = resources.displayMetrics.widthPixels
-        val computedWidth = minOf(displayWidthPx / 3, maxWidthPx)
+            val breakpointSwDp = resources.getInteger(R.integer.boards_drawer_tablet_breakpoint_sw_dp)
+            val computedWidth = BoardsDrawerWidthCalculator.computeWidth(
+                smallestScreenWidthDp = resources.configuration.smallestScreenWidthDp,
+                tabletBreakpointSwDp = breakpointSwDp,
+                windowWidthPx = drawerLayout.width,
+                maxWidthPx = maxWidthPx,
+            )
             drawerContent.layoutParams = drawerContent.layoutParams.apply {
                 width = computedWidth
             }
         }
+    }
 
     private fun forceSignOutToLogin() {
         lifecycleScope.launch {

app/src/main/java/space/hackenslacker/kanbn4droid/app/boards/BoardsDrawerWidthCalculator.kt

@@ -0,0 +1,15 @@
+package space.hackenslacker.kanbn4droid.app.boards
+
+object BoardsDrawerWidthCalculator {
+    fun computeWidth(
+        smallestScreenWidthDp: Int,
+        tabletBreakpointSwDp: Int,
+        windowWidthPx: Int,
+        maxWidthPx: Int,
+    ): Int {
+        if (smallestScreenWidthDp < tabletBreakpointSwDp) {
+            return windowWidthPx
+        }
+        return minOf((windowWidthPx * 2) / 3, maxWidthPx)
+    }
+}

app/src/main/res/values/integers.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <integer name="boards_drawer_tablet_breakpoint_sw_dp">600</integer>
+</resources>

app/src/test/java/space/hackenslacker/kanbn4droid/app/boards/BoardsDrawerWidthCalculatorTest.kt

@@ -0,0 +1,78 @@
+package space.hackenslacker.kanbn4droid.app.boards
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class BoardsDrawerWidthCalculatorTest {
+    @Test
+    fun smallScreenUsesFullWidth() {
+        val result = BoardsDrawerWidthCalculator.computeWidth(
+            smallestScreenWidthDp = 411,
+            tabletBreakpointSwDp = 600,
+            windowWidthPx = 1080,
+            maxWidthPx = 900,
+        )
+
+        assertEquals(1080, result)
+    }
+
+    @Test
+    fun smallScreenUsesFullWidthIgnoringCap() {
+        val result = BoardsDrawerWidthCalculator.computeWidth(
+            smallestScreenWidthDp = 411,
+            tabletBreakpointSwDp = 600,
+            windowWidthPx = 1080,
+            maxWidthPx = 320,
+        )
+
+        assertEquals(1080, result)
+    }
+
+    @Test
+    fun boundaryAtBreakpointUsesLargeRule() {
+        val result = BoardsDrawerWidthCalculator.computeWidth(
+            smallestScreenWidthDp = 600,
+            tabletBreakpointSwDp = 600,
+            windowWidthPx = 1000,
+            maxWidthPx = 700,
+        )
+
+        assertEquals(666, result)
+    }
+
+    @Test
+    fun largeScreenAppliesTwoThirdsWithCap() {
+        val result = BoardsDrawerWidthCalculator.computeWidth(
+            smallestScreenWidthDp = 1024,
+            tabletBreakpointSwDp = 600,
+            windowWidthPx = 1024,
+            maxWidthPx = 700,
+        )
+
+        assertEquals(682, result)
+    }
+
+    @Test
+    fun boundaryBelowBreakpointUsesSmallRule() {
+        val result = BoardsDrawerWidthCalculator.computeWidth(
+            smallestScreenWidthDp = 599,
+            tabletBreakpointSwDp = 600,
+            windowWidthPx = 1000,
+            maxWidthPx = 700,
+        )
+
+        assertEquals(1000, result)
+    }
+
+    @Test
+    fun largeScreenUsesCapWhenTwoThirdsExceedsCap() {
+        val result = BoardsDrawerWidthCalculator.computeWidth(
+            smallestScreenWidthDp = 840,
+            tabletBreakpointSwDp = 600,
+            windowWidthPx = 840,
+            maxWidthPx = 560,
+        )
+
+        assertEquals(560, result)
+    }
+}