dangernoodle-io / breadboard / 29885158165

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refactor: group display/led/button components into family subdirs (B1-980) (#988)

Moves 14 components into components/display/, components/led/, and
components/button/ family group directories, alongside the already-moved
bb_display_ssd1306 canary (#985):

- display: bb_display, bb_display_spi_common, bb_display_ek79007,
  bb_display_ili9341, bb_display_st77xx
- led: bb_led, bb_led_anim, bb_led_apa102, bb_led_gpio, bb_led_pwm,
  bb_led_rgb_pwm
- button: bb_button, bb_button_events, bb_button_gpio

Each moved component's CMakeLists.txt relative platform/ path bumped one
level (../../ -> ../../../, 20 lines across the 14 moved components);
examples/smoke/platformio.ini -I and build_src_filter paths updated to
match. Scaffolds components/led/README.md and components/button/README.md
(group index) and regenerates the top-level components/README.md index.

platform/<plat>/<name>/ dirs stay FLAT and untouched -- nesting platform
dirs is unsupported and breaks discovery.

components/bb_display_spi_common/CMakeLists.txt renders as delete+add
rather than a detected rename (git's default 50% similarity threshold;
this file scores ~31%), so `git log --follow` stops there for that one
file. This is expected, not a botched move -- history is recoverable with
`git log --follow -M20% -- components/display/bb_display_spi_common/CMakeLists.txt`.

This taxonomy is PROVISIONAL: families only, grouping strictly by leaf
name prefix. The final category set (functional grouping, subsystem
boundaries, etc.) is deliberately undecided pending remaining
refactoring.

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