Replace mentions of pounds with dollars on the hosted site

[Copilot]

What changed

Replaced all mentions of "pounds" with "dollars" across the web assets to align currency localization on the hosted site.

Key Changes

• Site Template (site/index.template.html): Swapped currency reference in the board acquisition description paragraph:

  -    ESP32 CYD boards anybody can buy for a few pounds, in cases anybody can
  +    ESP32 CYD boards anybody can buy for a few dollars, in cases anybody can

• Site Generator (tools/gen_site.py): Updated the internal Python code comment:

  -# a reader deciding whether to buy a twelve-pound board does not need to see
  +# a reader deciding whether to buy a twelve-dollar board does not need to see

Why

The hosted site (GitHub Pages landing page) contained UK-centric currency phrasing ("pounds") that has been updated to "dollars" for more global familiarity and clarity.

How it was tested

• pio run succeeds
• python tools/check_docs.py, check_boards.py, check_catalog.py and check_frame_rules.py are clean
• Flashed and used on hardware
• Both orientations checked (system/UI screens only — they must read tft.width()/height(), never SCREEN_WIDTH/SCREEN_HEIGHT)

Size figures (from your own pio run, if the firmware changed):

RAM:   x.x% (used ..... bytes from 327680 bytes)
Flash: xx.x% (used ....... bytes from 3145728 bytes)

Docs in the same commit

• README.md — feature set, game count, size figures, version
• CHANGELOG.md
• CLAUDE.md / AGENTS.md / the relevant directory CLAUDE.md
• The About app — and it derives the fact rather than restating it
• python tools/gen_screens.py re-run, and I looked at the PNGs
• New stills added to PLAYABLE_STILLS/SYSTEM_SHOWCASE and SCREEN_CAPTIONS in tools/gen_site.py
• Nothing here changed any of the above

The two rules that outrank everything

• This adds no new outbound flow. Exactly three things leave the
  device — an NTP query, one ip-api.com timezone lookup, and the opt-in
  BLE beacon. If this PR changes that, stop and open an issue first: it is
  a change to what the product promises, not a feature to be reviewed on
  merit. If it changes what is transmitted or stored, the About radio page,
  the README privacy section and the installer page are part of this
  commit.
• No AI attribution in the commits. No Co-Authored-By: naming a
  model, no "Generated with…" footers, in commits or in this description.

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Part of Braino! by iamankushpandit. Copyright © 2026 iamankushpandit, licensed GPL-3.0-or-later alongside the code — reuse of this document, in whole or in part, must keep this attribution and stay under the same licence. See NOTICE.md.