Add icon picker for floating window triggers and increase label font size

[Programmer-MrWang]

Motivation

• Provide a visual icon picker to make it easier to choose and preview icons for floating window buttons.
• Improve the layout and usability of the floating trigger settings panel by adding a two-column grid and a dedicated drawer for icon selection.
• Improve label readability in the floating window by increasing the button name font size.

Description

• Increased the floating-window button name font size from 10 to 12 in Services/FloatingWindowService.cs to improve readability.
• Reworked Settings/FloatingWindowTriggerSettings.cs to replace the simple stack layout with a two-column Grid and added an icon drawer panel built by BuildIconDrawer() that contains a virtualized ListBox of icon rows.
• Implemented an icon picker flow with OpenIconDrawer(), CloseIconDrawer(), SelectIcon(string), LoadIconRows(), and UI helpers BuildRowPanel(IconRow) and BuildIconDrawer(), plus the IconItem and IconRow records to represent available icons and rows.
• Added constants IconCodeStart, IconCodeEnd, and IconsPerRow and wired the icon TextBox and a new "选择图标" button to update Settings.Icon immediately on selection.

Testing

• No automated tests were added for the new UI functionality.
• No automated test suite was run as part of this change.

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Collapse icon-drawer column when drawer is closed

The grid reserves a fixed 420-pixel second column regardless of whether _iconDrawer is visible, so closing the drawer only hides its content and still permanently shrinks the main settings form. In narrower settings hosts this can make the editable fields feel cramped or clipped even before the user opens the picker; the column width should be toggled with drawer state (or use Auto/splitter behavior) instead of staying fixed.

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[chatgpt-codex-connector]

Constrain icon list viewport to preserve virtualization

Placing the icon ListBox inside a vertical StackPanel gives it effectively unbounded height during measure, which can defeat list virtualization and force creation of the full icon grid when the drawer opens. Given LoadIconRows() builds hundreds of rows from the 0xE000..0xF4D3 range, this can cause a noticeable UI stall; use a layout that constrains the list (for example a Grid row with * height or explicit max height) so virtualization can work.

Useful? React with 👍 / 👎.