[mipi_dsi] Document DMA2D async flush options

[kyvaith]

Description

Documents the use_dma2d and async_lvgl_flush options added by esphome/esphome#16853.

Related pull request

• [mipi_dsi] Add DMA2D-backed async flush support esphome#16853

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Walkthrough

This PR updates many documentation pages and site metadata: a version bump, new Router speaker docs, new MIPI DSI options, numerous component documentation clarifications/additions, and CLI/security guide updates.

Changes

Documentation updates (site-wide)

Layer / File(s)	Summary
Version and index data/version.yaml, src/content/docs/components/index.mdx	Bumps version/release to 2026.6 series and adds a "Router Speaker" entry to the components index.
Display docs src/content/docs/components/display/mipi_dsi.mdx, src/content/docs/components/display/nextion.mdx, src/content/docs/components/display/sdl.mdx, src/content/docs/components/lvgl/index.mdx, src/content/docs/components/lvgl/widgets.mdx	Documents use_dma2d and async_lvgl_flush for MIPI DSI; removes Nextion dump_device_info; refines SDL window_options.position and install notes; updates LVGL byte_order and adds meter rounded.
Speaker platforms src/content/docs/components/speaker/router.mdx, src/content/docs/components/speaker/mixer.mdx, src/content/docs/components/speaker/i2s_audio.mdx	Adds router speaker docs and example; adds mixer bits_per_sample; updates i2s_audio SPDIF constraints and example YAML.
Climate & Light src/content/docs/components/climate/mitsubishi_cn105.mdx, src/content/docs/components/light/index.mdx	Adds supported_swing_modes to Mitsubishi CN105 docs; documents light.effect.next/previous and exposes it LightState variable in lambda examples.
I²C and RP2040 src/content/docs/components/i2c.mdx, src/content/docs/components/rp2040.mdx	Adds host platform to I²C docs and reorganizes per-platform variables and multi-bus guidance; introduces RP2040 variant and board/variant validation rules.
Network / Ethernet / USB UART src/content/docs/components/network.mdx, src/content/docs/components/ethernet.mdx, src/content/docs/components/usb_uart.mdx	Clarifies enable_ipv6 on nRF52; adds enable_on_boot and Ethernet actions/conditions; updates USB UART supported device list and type values.
Sensor / Time / Packages src/content/docs/components/sensor/dsmr.mdx, src/content/docs/components/time/homeassistant.mdx, src/content/docs/components/time/index.mdx, src/content/docs/components/packages.mdx	Refines DSMR CRC guidance and examples; clarifies timezone handling and UTC-empty-string behavior; lists supported shorthand Git hosts for packages.
Guides & Security src/content/docs/guides/cli.mdx, src/content/docs/guides/security_best_practices.mdx	Adds --states/--no-states CLI docs for run/logs and revises WiFi min_auth_mode guidance to default to WPA2 across platforms.

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs:

• esphome/esphome.io#6637: Related LVGL byte_order documentation changes.
• esphome/esphome.io#6737: Related Light lambda it variable documentation and example changes.

Suggested labels:
component: display

Suggested reviewers:

• ssieb
• clydebarrow

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title '[mipi_dsi] Document DMA2D async flush options' accurately describes the main change—documenting the use_dma2d and async_lvgl_flush options in the MIPI DSI documentation.
Description check	✅ Passed	The description is directly relevant to the changeset, explaining that it documents the use_dma2d and async_lvgl_flush options added by a related ESPHome PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[esphome]

As this is a feature matched with a PR in https://github.com/esphome/esphome, please target your PR to the next branch and rebase.

Base branch has been corrected - dismissing previous review.

[kyvaith]

I opened esphome/esphome#16873 as the shared architecture/performance discussion for the ESP32-P4 LVGL/MIPI DSI PR stack. It includes how the MIPI DSI docs fit into the async flush, DMA2D, zero-copy/cache-sync, PPA, and LVGL 9.5 work, plus downstream benchmark numbers.

For cross-PR design questions it is probably easier to discuss there and keep this docs PR focused on documenting the scoped options.