"Flash to real board" no longer needs a prior Compile. The menu item is
enabled for every Arduino/ESP-IDF board (MicroPython keeps its own
gating) and the Flash dialog compiles first when the board has no program
or its code changed since the last build — compiler output streams into
the dialog's console, a red build ends in an error banner there with a
"Recompile & flash" retry, and only a green build reaches the flasher.
Web Serial's port picker needs a user gesture, so the web flow asks the
overlay to grant the port at the click (new WebFlashImpl.preparePort)
before the compile that may take minutes.
Stale detection: compileBoardProgram() now records a fingerprint of the
sources + language + build options (BoardInstance.compiledSourceHash,
utils/sourceFingerprint.ts); the dialog warns and rebuilds when the live
sources differ. utils/boardCompile.ts holds the compile request builder
shared with the toolbar (same files, same options).
The whole dialog and the menu hints are translated (editor.flash.* and
editor.canvas.flashHint.* in the 9 locales); before, every string was
hard-coded English.
Entitlement seam for #207 (desktop "upload to board"): lib/proWebFlash.ts
gains installHardwareFlashGate(); OSS default allows, and when a gate
blocks, the dialog shows a paid-license panel with a "See plans" link
instead of the port picker.
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