Add unified input options button

[joshliebe]

Task/Issue URL: https://app.asana.com/1/137249556945/project/1200204095367872/task/1214711234868174?focus=true

Description

• Adds a options button to the native input

Steps to test this PR

_With the native input enabled

• Toggle to Duck.ai
• Verify that the button is visible
• Tap the button
• Verify that the dialog shows

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Note

Low Risk
Low risk UI-only change that adds a new native-input plugin and popup menu; main risk is layout/positioning regressions or plugin visibility toggling in the unified input widget.

Overview
Adds a new native-input OptionsNativeInputPlugin that renders an options icon in the unified input bottom row and opens a popup menu (OptionsView) when tapped.

Introduces new menu item layouts/resources (icons, divider, strings) and wires a new optionsButtonContainer ID into view_native_input_mode_switch_widget.xml so the host can place the plugin’s view alongside the attach button.

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[joshliebe]

• Add unified input options button #8535 👈 (View in Graphite)
• develop

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[malmstein]

Works as expected. Make sure to remove the Customise Responses item though, we don’t need it.