[intv][pico][firmware] Update embedded CONFIG ROM: colour + selection-bar flicker fix

[tschak909]

Re-embeds the Intellivision CONFIG ROM from fujinet-config/intv, covering two upstream changes:

1. Colour pass (fujinet-config 7b3b2ae) — the CONFIG screens got a real palette: FGBG backgrounds on the host and info screens, a colour-stack selection bar and file-type glyphs in the file browser.
2. Selection-bar flicker fix (fujinet-config 49ce329) — every screen with a selection bar repainted its entire list on each cursor move. #BACKTAB is the live STIC display list with no shadow buffer, and an NTSC frame only affords ~50 IntyBASIC cell writes, so those repaints (~320 cells on the host list, a blocking mailbox round trip per row on the WiFi list) were scanned out half-finished for several frames running. The file browser additionally spent a >1-frame window carrying 2 of its 4 colour-stack advance bits, shifting everything below the bar one stack position.

Firmware-side changes

config.cfg's [mapping] moved with the image size, so all four mm_add() tuples in fuji_config_map() were re-transcribed — cross-checked by regexing both files and comparing tuples, not by eye, since a stale entry maps a segment short and the code past it is silently unreachable:

before	after
$1000-$1F9C -> $6000	$1000-$1ECA -> $6000
$1F9D-$2B49 -> $D000	$1ECB-$2BC2 -> $D000
$2B4A-$3036 -> $F000	$2BC3-$30AF -> $F000

FUJI_STAGE_BASE is unchanged — the image is 0x30B0 words and 0x3100 remains the next 256-word boundary past it, which the existing _Static_assert confirms at compile time.

Verification

• pirto_ii_default configures, compiles and links clean.
• The new 24928-byte config.bin appears verbatim in Minty_pirto_ii_default.elf, and the previous 24686-byte image is gone.
• Upstream, the ROM was exercised under jzIntv with a probe driving both list screens: the host list cycles its selection bar with every glyph intact and correctly uppercase-folded, and the file browser walks its bar with all four colour-stack advance bits in phase in every frame.

Not yet exercised on real PiRTO II hardware.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Ew7HzDQ3PHtp1uTh7BaT1D

[tschak909]

sorry. one more change. This fixes the flickering while moving the selection bar in various screens by drastically optimizing the output path!