Suggest firmware updates and auto-open device info post-connect

[makermelissa-piclaw]

Refs #357.

Adds a small firmware-check helper and surfaces "newer firmware available" suggestions in the Discovery and Device Info modals, plus auto-opens the Device Info dialog after a fresh connect across all three workflows (Web / USB / BLE) so the suggestion is visible without needing to click the Info button.

What it does

• js/common/firmware-check.js parses CircuitPython version strings (e.g. 9.2.8, 10.0.0-alpha.1, 10.0.0-rc.0, plus a tolerant -dirty suffix) into a comparable structure.
• It fetches the list of releases from api.github.com/repos/adafruit/circuitpython/releases (cached for the lifetime of the page) and picks the highest stable release and the highest dev pre-release.
• It then applies the rules from Check if running latest firmware and suggest upgrade #357 to decide what to suggest:
  • If the user is on a development release:
    • Suggest the latest stable if it is newer than what they're on.
    • Suggest the latest dev release if it is newer than what they're on.
  • If the user is on a stable release:
    • Suggest a newer stable if any.
    • Suggest the latest dev release if any.
  • If only a stable release exists at all (no current dev), only the stable suggestion shows up.
• Both DiscoveryModal and DeviceInfoModal now render those suggestions under the device info table, linking to the board's download page on circuitpython.org so the user gets the build that actually exists for their board.

Post-connect dialog

Previously only the Web workflow auto-opened a dialog after connecting; USB/BLE users had to click the Info button to see device info (and now the firmware suggestion). This PR moves the post-connect "show info" trigger into loadEditor() so all three workflows behave the same way:

• One-shot per connection session — silent reconnects do NOT re-pop the dialog.
• Reset on actual disconnect via disconnectCallback.
• Fire-and-forget so the rest of the post-connect flow (busy spinner, parameterized doc loading) isn't blocked while the user reads the info.
• Gated on workflow.connectionStatus() so it doesn't try to open before the workflow has fully connected.

USBWorkflow.onConnected was also reordered to run super.onConnected(e) before loadEditor() — previously loadEditor ran while _connected was still CONNSTATE.partial, which would have made the new gate skip the dialog on USB.

Why GitHub releases?

circuitpython.org does publish per-board builds via _data/files.json, but that file isn't exposed as a public endpoint. The GitHub releases API is CORS-friendly, doesn't require auth for low-volume reads, and is canonical for stable vs prerelease tags. Per-board availability is left to the deep-link to the board page, which only lists firmware that was actually built for that board.

UX

• The suggestion box is rendered into a container that is empty by default, so the dialog layout doesn't shift if the API hasn't responded yet — and &:empty { display: none; } hides the container entirely if there's nothing to suggest.
• API failures are non-fatal: a console warning is logged and the dialog renders unchanged.

Notes for review

• Version comparison treats stable as ranked above any pre-release at the same X.Y.Z (e.g. 10.0.0 > 10.0.0-rc.0 > 10.0.0-beta.0 > 10.0.0-alpha.1).
• Pre-release labels are ranked alpha < beta < rc and then by their numeric suffix.
• The repo doesn't have a JS test setup, so I verified the parser/comparator and suggestion logic with a quick Node import of the module locally; happy to paste those checks as a comment or to add a tiny browser sketch if useful.

[makermelissa-piclaw]

Pushed a follow-up commit that makes USB and BLE behave the same as Web: the Device Info dialog now auto-opens once after every fresh connect, so the firmware-update suggestion is visible without the user needing to click the Info button.

• Trigger moved from checkConnected() (Web-only branch) into loadEditor(), which all three workflows already call after a successful connect.
• A one-shot shownDeviceInfoForCurrentSession flag prevents silent reconnects from re-popping the dialog; the flag resets on disconnect.
• Dialog is opened fire-and-forget so the post-connect spinner / parameterized doc loading isn't blocked while the user reads the info.
• Removed the now-redundant explicit showInfo() calls in checkConnected() and the URL-backend bootstrap path.

[makermelissa]

I tested this locally.