launcher.sh received the dock browser as one shell line and recovered the
executable with `${3%% *}`: a Chromium under '/opt/Google Chrome/' or a
profile dir under a HERMES_HOME with a space split at the first blank, the
existence check failed or Exec= became garbage, and the dock had no working
Browser icon.
Python now hands the launcher the bare executable (HERMES_BD_BROWSER_EXEC, for
the `command -v` check) and a ready-made Exec= line
(HERMES_BD_BROWSER_EXEC_LINE) built by `browser.dock_exec_line`: each argument
double-quoted, reserved characters backslash-escaped inside the quotes and the
backslashes string-escaped once more, per the Desktop Entry spec. `dock_argv`
is the single source of the dock's arguments (incl. the root sandbox flags).
Test: tests/tools/test_bot_desktop_browser.py — a spaced executable and a
spaced, quote-bearing profile dir produce a correctly quoted Exec= line
(AttributeError on the previous commit); the launcher seed test keeps running
the real script (`bash -n` clean).
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