feat: Enable panel resizing on tablets and foldable devices

[Elouan1411]

No description provided.

[Copilot]

Pull request overview

This PR introduces a draggable separator to allow users to resize the two-pane UI on tablets and foldable devices, and persists the chosen pane ratio across sessions.

Changes:

• Add a drag separator UI (line + handle) to two-pane layouts (thread list and search).
• Implement touch-driven resizing logic in TwoPaneFragment, with persistence via LocalSettings/TwoPaneViewModel.
• Adjust a few layouts for better responsiveness (empty state width handling, message date truncation).

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
app/src/main/res/values/dimens.xml	Adds new sizing dimens for min pane widths and drag separator visuals.
app/src/main/res/layout/view_empty_state.xml	Makes empty state content adapt better to wider containers.
app/src/main/res/layout/item_message.xml	Adds single-line truncation behavior for the message date.
app/src/main/res/layout/fragment_thread_list.xml	Adds the draggable separator view between list and thread panes.
app/src/main/res/layout/fragment_search.xml	Adds the draggable separator view between results list and thread pane.
app/src/main/res/drawable/item_vertical_drag_handle.xml	Adds selector drawable for the drag handle.
app/src/main/res/drawable/item_drag_line.xml	Adds selector drawable for the separator line.
app/src/main/java/com/infomaniak/mail/ui/main/search/SearchFragment.kt	Exposes the separator view to TwoPaneFragment.
app/src/main/java/com/infomaniak/mail/ui/main/folder/TwoPaneViewModel.kt	Stores/restores the left pane ratio and persists it.
app/src/main/java/com/infomaniak/mail/ui/main/folder/TwoPaneFragment.kt	Implements drag-to-resize and updated two-pane width computation.
app/src/main/java/com/infomaniak/mail/ui/main/folder/ThreadListFragment.kt	Exposes the separator view to TwoPaneFragment.
app/src/main/java/com/infomaniak/mail/data/LocalSettings.kt	Adds a persisted leftPaneRatio preference.

Comments suppressed due to low confidence (1)

app/src/main/res/layout/item_message.xml:117

• shortMessageDate is constrained start/end in a ConstraintLayout, but still uses layout_width="wrap_content". For ellipsizing to reliably work (as you already do for expeditorName), it should be width 0dp (match constraints) or set app:layout_constrainedWidth="true"; otherwise it can measure beyond constraints and never ellipsize.

                <TextView
                    android:id="@+id/shortMessageDate"
                    style="@style/Label.Secondary"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginEnd="@dimen/marginStandardSmall"
                    android:ellipsize="end"
                    android:lines="1"
                    app:layout_constraintBaseline_toBaselineOf="@id/expeditorName"
                    app:layout_constraintEnd_toEndOf="parent"
                    app:layout_constraintStart_toEndOf="@id/scheduleSendIcon"
                    tools:text="9 déc 2021 à 11:00" />

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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