Support Bottom Address Bar in the Input Screen (#6849)

Task/Issue URL:
https://app.asana.com/1/137249556945/project/1208671518894266/task/1211468322303336?focus=true

### Description
Adds bottom omnibar support to the Input Screen.

To achieve this, the PR:
- Introduces top and bottom containers for the `InputModeWidget` and
injects it into the right position after evaluating the current status
of the browser screen's omnibar and the feature flag.
- Extracts the control buttons (voice, new line, submit) to a new class
that can be reused across top and bottom configurations:
- If top configuration is used, the backgrounds and shadows are
transformed to look like floating buttons and placed directly into the
`InputScreenFragment`.
- If bottom configuration is used, the buttons remain flat and are
placed inside of the `InputModeWidget`.

This PR also introduces content separator between scrolalble
autocomplete or new tab content. This is a lightly colored line instead
of the previously used gradient.

You might notice a lot of unrelated changes in the PR, specifically in
6dd61f5
and
0013b95
commits. This is a side-effect of recent ratchet-based code formatting
update.

### Steps to test this PR

- [x] Enable Input Screen.
- [x] Verify that opening the Input Screen happens with a slide
transition.
- [x] Verify that Dax is in sync when transitioning.
- [x] Verify that buttons are placed near the keyboard and have floating
shadows and circular backgrounds.
- [x] Verify that closing the Input Screen (with a back button/arrow)
happens with a slide transition.
- [x] Go to settings and change the appearance to use bottom omnibar.
- [x] Verify that opening the Input Screen happens with a fade
transition.
- [x] Verify that buttons are borderless and without shadows (besides
the blue submit button).
- [x] Verify that autocomplete arrows point down for editing.
- [x] Verify there's no blur covering bottom of autocomplete results and
that they can be scrolled all the way up.
- [x] Verify that when there are no action buttons available, the view
collapses tom hide the empty line.
- [x] Verify that creating new lines in Duck.ai mode expands the text
view up.
- [x] Verify that closing the Input Screen (with a back button/arrow)
happens with a fade transition.
- [x] Add favorites.
- [x] Verify that favorites are in sync when opening/closing the Input
Screen.
- [x] Go to internal Feature Flag Inventory and disable the
`inputScreenBottomBarSupport` flag.
- [x] Restart the app.
- [x] Verify that even though the bottom omnibar is set, when opening
the Input Screen the bar is at the top.
- [x] Verify that favorites are in sync when opening/closing the Input
Screen.

### UI changes
| focus | autocomplete | duck-ai | favorites | multiline |
|-------|--------------|---------|-----------|-----------|
| <img width="960" height="2142" alt="focus"
src="https://github.com/user-attachments/assets/3ae4782e-4c45-4fb6-8eea-d900cd27ae45"
/> | <img width="960" height="2142" alt="autocomplete"
src="https://github.com/user-attachments/assets/9070c7d1-8c90-49e4-a717-79219219527d"
/> | <img width="960" height="2142" alt="duck-ai"
src="https://github.com/user-attachments/assets/04fbb8c7-c918-4c1e-8f0f-0ebfbe1b2420"
/> | <img width="960" height="2142" alt="favorites"
src="https://github.com/user-attachments/assets/98ef041c-1359-4572-9905-876ea4a511c7"
/> | <img width="960" height="2142" alt="multiline"
src="https://github.com/user-attachments/assets/086ba507-bd25-4ad8-b46d-a98138952284"
/> |


https://github.com/user-attachments/assets/57d98124-54a0-4f1a-993a-157e5ce0f0d9



https://github.com/user-attachments/assets/a95c0b3f-e9aa-44de-bf40-c4d3e7b4169c



https://github.com/user-attachments/assets/402bc03a-1b6d-41fb-8067-08a90bcdd581

Author: LukasPaczos

app/src/main/java/com/duckduckgo/app/browser/BrowserTabFragment.kt

@@ -1117,10 +1117,10 @@ class BrowserTabFragment :
         val intent =
             globalActivityStarter.startIntent(
                 requireContext(),
-                InputScreenActivityParams(query = query),
+                InputScreenActivityParams(query = query, isTopOmnibar = omnibar.omnibarPosition == TOP),
             )
-        val enterTransition = browserAndInputScreenTransitionProvider.getInputScreenEnterAnimation()
-        val exitTransition = browserAndInputScreenTransitionProvider.getBrowserExitAnimation()
+        val enterTransition = browserAndInputScreenTransitionProvider.getInputScreenEnterAnimation(omnibar.omnibarPosition == TOP)
+        val exitTransition = browserAndInputScreenTransitionProvider.getBrowserExitAnimation(omnibar.omnibarPosition == TOP)
         val options =
             ActivityOptionsCompat.makeCustomAnimation(
                 requireActivity(),
@@ -1638,8 +1638,10 @@ class BrowserTabFragment :
                             val result = downloadsFileActions.openFile(it, File(command.filePath))
                             if (!result) {
                                 view
-                                    .makeSnackbarWithNoBottomInset(getString(R.string.downloadsCannotOpenFileErrorMessage), Snackbar.LENGTH_LONG)
-                                    .show()
+                                    .makeSnackbarWithNoBottomInset(
+                                        text = getString(R.string.downloadsCannotOpenFileErrorMessage),
+                                        duration = Snackbar.LENGTH_LONG,
+                                    ).show()
                             }
                         }
                     }

app/src/main/java/com/duckduckgo/app/browser/BrowserTabViewModel.kt

@@ -380,7 +380,6 @@ import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.flow.stateIn
-import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import logcat.LogPriority.ERROR

app/src/main/java/com/duckduckgo/app/browser/omnibar/SingleOmnibarLayout.kt

@@ -40,7 +40,6 @@ import com.duckduckgo.common.ui.view.toPx
 import com.duckduckgo.di.scopes.FragmentScope
 import com.duckduckgo.navigation.api.GlobalActivityStarter
 import com.google.android.material.card.MaterialCardView
-import com.google.android.material.color.MaterialColors.*
 import dagger.android.support.AndroidSupportInjection
 import javax.inject.Inject
 import com.duckduckgo.mobile.android.R as CommonR

app/src/main/java/com/duckduckgo/app/systemsearch/SystemSearchActivity.kt

@@ -78,7 +78,6 @@ import com.duckduckgo.common.ui.view.KeyboardAwareEditText
 import com.duckduckgo.common.ui.view.addBottomShadow
 import com.duckduckgo.common.ui.view.dialog.TextAlertDialogBuilder
 import com.duckduckgo.common.ui.view.hideKeyboard
-import com.duckduckgo.common.ui.view.show
 import com.duckduckgo.common.ui.view.showKeyboard
 import com.duckduckgo.common.ui.viewbinding.viewBinding
 import com.duckduckgo.common.utils.KeyboardVisibilityUtil

duckchat/duckchat-api/src/main/java/com/duckduckgo/duckchat/api/inputscreen/BrowserAndInputScreenTransitionProvider.kt

@@ -20,12 +20,11 @@ package com.duckduckgo.duckchat.api.inputscreen
  * Provides animation resources for activity transitions between browser and input screen.
  */
 interface BrowserAndInputScreenTransitionProvider {
+    fun getBrowserEnterAnimation(isTopOmnibar: Boolean): Int
 
-    fun getBrowserEnterAnimation(): Int
+    fun getBrowserExitAnimation(isTopOmnibar: Boolean): Int
 
-    fun getBrowserExitAnimation(): Int
+    fun getInputScreenEnterAnimation(isTopOmnibar: Boolean): Int
 
-    fun getInputScreenEnterAnimation(): Int
-
-    fun getInputScreenExitAnimation(): Int
+    fun getInputScreenExitAnimation(isTopOmnibar: Boolean): Int
 }

duckchat/duckchat-api/src/main/java/com/duckduckgo/duckchat/api/inputscreen/InputScreenActivityParams.kt

@@ -24,9 +24,11 @@ import com.duckduckgo.navigation.api.GlobalActivityStarter
  * Parameters for launching the Input Screen activity.
  *
  * @param query The initial query text to pre-populate in the input field
+ * @param isTopOmnibar whether the omnibar is positioned at the top of the screen
  */
 data class InputScreenActivityParams(
     val query: String,
+    val isTopOmnibar: Boolean,
 ) : GlobalActivityStarter.ActivityParams
 
 /**

duckchat/duckchat-api/src/main/res/anim-v33/fade_in_dark.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (c) 2025 DuckDuckGo
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+    android:backdropColor="@color/background_background_dark"
+    android:duration="@integer/input_screen_slide_animation_duration_ms"
+    android:showBackdrop="true">
+
+    <alpha
+        android:fromAlpha="0.0"
+        android:interpolator="@android:anim/decelerate_interpolator"
+        android:toAlpha="1.0" />
+
+</set>

duckchat/duckchat-api/src/main/res/anim-v33/fade_in_light.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (c) 2025 DuckDuckGo
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+    android:backdropColor="@color/background_background_light"
+    android:duration="@integer/input_screen_slide_animation_duration_ms"
+    android:showBackdrop="true">
+
+    <alpha
+        android:fromAlpha="0.0"
+        android:interpolator="@android:anim/decelerate_interpolator"
+        android:toAlpha="1.0" />
+
+</set>

duckchat/duckchat-api/src/main/res/anim-v33/fade_out_dark.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (c) 2025 DuckDuckGo
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+    android:backdropColor="@color/background_background_dark"
+    android:duration="@integer/input_screen_slide_animation_duration_ms"
+    android:showBackdrop="true">
+
+    <alpha
+        android:fromAlpha="1.0"
+        android:interpolator="@android:anim/decelerate_interpolator"
+        android:toAlpha="0.0" />
+
+</set>

duckchat/duckchat-api/src/main/res/anim-v33/fade_out_light.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (c) 2025 DuckDuckGo
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+    android:backdropColor="@color/background_background_light"
+    android:duration="@integer/input_screen_slide_animation_duration_ms"
+    android:showBackdrop="true">
+
+    <alpha
+        android:fromAlpha="1.0"
+        android:interpolator="@android:anim/decelerate_interpolator"
+        android:toAlpha="0.0" />
+
+</set>