feat(v0.9): Home UI — 8 icons/page, pagination, centered settings button and configurable label colors

[Inter-Raptor]

Motivation

• Reduce the number of app icons shown per page from 10 to 8 and add page navigation controls so the launcher is easier to use on smaller screens.
• Provide a centered settings button with an gear sprite and translated label, and make home labels styling configurable (color, custom hex) and visually consistent with game icon labels.
• Add UI polish: rounded icon frames, transparent labels, optional info-badge and configurable boot/title image display time.

Description

• Changed home layout capacity: SLOT_COUNT_PER_PAGE set to 8, removed the old extra slots and adjusted grid/placement and page math in RaptorLauncher_V0.9/launcher_ui.cpp.
• Added navigation arrows and a centered settings footer: new drawHomeNavigationButtons() uses Fleche and Engrenage sprites and updated touch handling for BTN_PREV, BTN_NEXT, and centered BTN_SETTINGS in launcher_ui.cpp.
• Added display helpers to support the new visuals: displayDrawSmallTextTransparent, displayFillRoundRect, displayDrawRoundRect, and displayDrawRGB565SpriteKey were added to RaptorLauncher_V0.9/display_manager.h/.cpp (also added #include <pgmspace.h> for sprite reads).
• Configurable home label and behaviour: new settings added to SystemSettings and implemented in RaptorLauncher_V0.9/settings_manager.{h,cpp} (home_text_color_mode, home_text_color_hex, home_show_info_badge, home_boot_image_ms) with defaults, load/save and serial logging; label color parsing and homeLabelColor() implemented in launcher_ui.cpp.
• Applied UI changes on home screen: rounded icon frames (ICON_RADIUS = 6), transparent small labels, optional ? badge (controlled by home_show_info_badge), and used home_boot_image_ms to control title/boot image delay.
• Updated SD settings file CarteSD/settings.json with the new keys and _comment_* keys documenting the options.

Testing

• Validated JSON syntax for CarteSD/settings.json with python -m json.tool and the file parsed successfully.
• No automated firmware build or runtime hardware tests were run in this environment (toolchain/flash not invoked).

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Codex Task