[DefKorns]

Moves the helpers that every list screen kept as its own lambdas into src/framework, and moves Save Manager and Module Uninstaller onto them.

• list_screen: ScreenChrome, DrawFooterDivider, DrawListRow, NoteBox, ScrollArrows. DrawLinesCentered moves into text_layout.
• panel_dialog: PanelDialog (Acknowledge / Confirm / ConfirmDestructive), DialogResult, ShowBusy, DropPendingInput.

Behaviour changes:

• Start+Select only confirms destructive actions. Other confirms use A, B cancels, and info dialogs close on A only.
• Power or SDL_QUIT inside a dialog now leaves the screen. It used to be swallowed.
• DropPendingInput resets every button after blocking work, not just A and B.
• Scroll arrows are centred like the main menu, and the down arrow mirrors the up arrow inside the list area.
• Save Manager tags repeated game names with their code and hides saves with no data.

Tested: plain and compat builds, tests/run_tests.sh. On the console, framebuffer dumps showed no pixel changes from the step 1 extraction, and every SM/MU dialog was checked with real buttons.

The add-ons (Favorites, Theme Selector, Gamepad tool) move over after the OM submodule bump.