Move config storage next to the install and auto-create it if missing

versapad_combined.DEFAULT_PATH was hardcoded to this one machine's OneDrive
desktop, which made the tool unusable anywhere else. versapad_data.app_dir()
now resolves to the running .exe's own folder when frozen, or the project
directory when run from source, and DEFAULT_PATH hangs off that instead.

load_or_fetch() previously raised when both the file was missing and the
board unreachable, blocking a fresh install with no config and no board
attached. It now falls back to an empty default_combined() in that case, so
the tool is immediately usable either way. desktop_viewer's
_current_profile_view() picks up the same fallback instead of re-implementing
a narrower version of it.

Also drop the hardcoded PROFILE_NAMES dict, which had drifted out of sync
with the profile_names already stored in the combined JSON -- renaming a
profile in Programmiermodus never showed up in the read-only/browser views.
server.py and desktop_viewer.py now read names from the same JSON everywhere.

versapad_data.CONFIG_PATHS (read-only interop with the official C# VersaGUI's
JSON export) is intentionally left on the OneDrive desktop -- nothing in
this codebase writes there, it's not part of this tool's own config.

(cherry picked from commit 5d14bdd826)

server.py

@@ -98,8 +98,8 @@ def render_page(profile):
         "encoders": [dict(e) for e in raw["encoders"]],
     })
     tabs = "".join(
-        f'<a class="tab {"active" if p == profile else ""}" href="/?profile={p}">{html.escape(vp.PROFILE_NAMES[p])}</a>'
-        for p in sorted(vp.PROFILE_NAMES)
+        f'<a class="tab {"active" if p == profile else ""}" href="/?profile={p}">{html.escape(combined["profile_names"][p])}</a>'
+        for p in range(vp.NUM_PROFILES)
     )
     cells = "".join(render_cell(b) for b in cfg["buttons"])
     encoders = "".join(render_encoder(e) for e in cfg["encoders"])
@@ -130,7 +130,7 @@ class Handler(BaseHTTPRequestHandler):
             profile = int(query.get("profile", ["0"])[0])
         except ValueError:
             profile = 0
-        if profile not in vp.PROFILE_NAMES:
+        if not (0 <= profile < vp.NUM_PROFILES):
             profile = 0
         try:
             body = render_page(profile).encode("utf-8")