feat(ip2country): prefs panel with DB-IP / MaxMind / Custom sources - #113

…d headless URL-helper test

The old IP2Country.md was structured around the v2.x manual workflow:
download the file from MaxMind, drop it in ~/.aMule, hand-edit
amule.conf for an auto-update URL. The new doc is structured around
the Preferences → IP2Country tab, with one section per source:

  * DB-IP (default, zero-config)
  * MaxMind GeoLite2 (Account ID + License Key)
  * Custom URL (escape hatch / mirrors)

Plus migration notes for users upgrading from v2.x
(GeoLite2-Country.mmdb auto-renamed to geoip.mmdb, legacy
GeoLiteCountryUpdateUrl in amule.conf migrated to Custom URL).

scripts/test-geoip-urls.sh is a small headless smoke test: it boots
amuled once per source configuration, captures the "Download new ..."
log line, and asserts the URL matches the expected pattern. Covers:

  * dbip       -> current-month dbip-country-lite-YYYY-MM.mmdb.gz
  * maxmind    -> https://<acct>:<key>@download.maxmind.com/.../...tar.gz
  * custom     -> URL passed through verbatim
  * maxmind w/ empty credentials -> surfaces the missing-credentials log

Run from repo root: ./scripts/test-geoip-urls.sh

CI failed on every non-Mac platform with

  PrefsUnifiedDlg.cpp:1269:47: error: invalid use of incomplete type
  'class CIP2Country'

Mac's looser transitive-include rules pulled IP2Country.h in via some
amule.h header chain, so the local build passed. Linux's stricter check
requires the include directly. Also need wx/filename.h for the
status-line file-size lookup (wxFileName::FileExists / GetSize).

Both #include lines are #ifdef'd on ENABLE_IP2COUNTRY to match the
guards around the IP2Country code paths in this file.

While we're here, regenerate po/amule.pot and merge into po/*.po so the
pot-sync CI check is back in sync with the new translatable strings
introduced by PreferencesIP2CountryTab and CIP2Country error messages.

…ching

Multiple bugs surfaced by GUI smoke testing on macOS:

1. Sub-panel switching glitched (e.g. "Download URL:" label stayed
   visible after switching to DB-IP)

  The three source-specific blocks were sibling widget groups parented
  under a single wxStaticBoxSizer, not real wxPanel children. Hiding
  individual widgets via Show(false) didn't propagate to nearby
  ID-less labels and didn't collapse sizer slots, so unrelated text
  from other sources stayed on screen.

  Wrap each block in a discrete wxPanel (re-using
  IDC_GEOIP_INFO_DBIP / MAXMIND / CUSTOM as the panel IDs). Now
  Show/Hide operates on the wxPanel as a unit, and a single
  Layout() call on the staticbox is safe (no cascade loop) because
  the children are full wxPanels — not raw widgets the wxOSX
  staticbox layout used to spin on.

2. Preferences dialog grew vertically because the multi-line status
   block + multi-line attribution text dominated the tallest tab

  Status block is now a single-line summary: "Status: Loaded (9.0
  MB) — Data by DB-IP.com" / "Status: Failed to load — ..." /
  "Status: Not found — ...". Full path moved to a tooltip. The
  attribution strings inside each sub-panel are also shortened
  (separator dashes instead of separate lines).

3. Status didn't refresh after a successful Update Now until the
  user flipped the source dropdown

  Add PrefsUnifiedDlg::RefreshIP2CountryStatusIfOpen() static hook;
  CamuleDlg::IP2CountryDownloadFinished() calls it after the new
  MMDB is loaded. The dialog's s_activeInstance pointer is set in
  the constructor and cleared in the new destructor, so the hook is
  a no-op if Preferences is closed.

4. "Status: ●" used a Unicode bullet that doesn't carry color
  semantics — the dot rendered themeless (white in dark mode), not
  the green/amber/red claimed in the code comments

  Drop the bullet. The state word ("Loaded" / "Failed to load" /
  "Not found") carries the semantics by itself and is accessible
  to screen readers without relying on color/glyph rendering.

5. Initial "Status: (queried on open)" placeholder was a
  user-visible string in wxTRANSLATE() that gets overwritten in
  microseconds by UpdateGeoIPStatus() during TransferToWindow

  Replace with wxEmptyString. Nothing to translate, nothing to see.

Pre-existing fixes in this commit (rebased from the earlier amend):
- MaxMind License-Key-only URL (drop Account ID field)
- ENABLE_IP2COUNTRY=OFF crash fix (gate Cfg bindings + remove dead
  disable-callback)
- Mac wxOSX layout-cascade hang (now resolved differently via real
  wxPanel children + single targeted Layout call)
- Auto-default ENABLE_IP2COUNTRY based on libmaxminddb detection

…eckbox gate

* Manual "Update now" failures (no License Key, no Custom URL, HTTP error
  after DB-IP fallback exhausted, unpack/rename failure) now raise a
  wxMessageBox parented to the prefs dialog in addition to the network
  log line. Auto-update on startup stays silent so a transient outage
  doesn't pop up on every cold boot. Plumbed via a manualUpdate flag on
  CIP2Country::Update + a static PrefsUnifiedDlg notifier hook.

* OnOk now detects when the user changed the GeoIP source (or the
  credential for the currently selected source) during the dialog
  session and kicks off Update(true) automatically — previously the
  new source was persisted but the on-disk file was still from the
  old source until the user remembered to click Update now.

* "Show country flags for clients" master checkbox now greys out the
  whole panel below it (source dropdown, all three sub-panels, license
  + URL fields, Update now button, auto-update checkbox, status line)
  via UpdateGeoIPControlsEnabled, called from OnGeoIPMasterToggle and
  TransferToWindow.

* One-shot LoadedSource backfill in CIP2Country::Enable: when an
  existing MMDB opens but GetGeoIPLoadedSource is empty (file pre-dates
  the source-aware prefs), attribute it to the currently configured
  source so the status line shows something meaningful.

* Drop "escape hatch" jargon from the source-dropdown tooltip.

Pulled in the new translatable strings from this branch (manual-update
failure popup title + reworded source-dropdown tooltip) by running
scripts/update-po.sh. Merged the regenerated pot into every .po so
Weblate stays in sync.

…" for Windows

Mojibake on Windows: the literal UTF-8 em-dash bytes (\xE2\x80\x94)
in _()-wrapped runtime strings hit the wx narrow-to-wide conversion
path through the ANSI codepage when there is no catalog hit, which
renders them as "â€\"". Linux/Mac happen to do UTF-8 conversion
there and looked fine, hiding the issue.

ASCII " - " sidesteps the encoding mess entirely and reads naturally
in the affected lines:

* Preferences > IP2Country status block (Loaded / Failed to load /
  Not found)
* Source-dropdown tooltip
* DB-IP / MaxMind / Custom URL sub-panel attribution + license text
* DB-IP early-month fallback log line

Em-dashes in source comments are left alone - they don't make it
into the binary.

po regen: scripts/update-po.sh; pot + all .po files updated to the
new ASCII msgids.