v2.5.0: History chart, web export, and marquee fix for nearest airport

Adds a 7-day bar-chart view of the flight logbook (Menu -> Flight
Options -> History chart), and a small built-in web server that
serves a logbook overview page plus a merged CSV export of all
logged days once the device is connected to WiFi (discoverable via
the "?" button on the Logbook files screen, which now also shows the
live device IP). Also fixes the "nearest airport" line on the
Location Presets screen, which previously used tft.setViewport() and
went completely invisible with our custom font - it now scrolls as a
proper marquee without relying on the viewport clip.

Also documents the standard release workflow in CLAUDE.md.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/i18n_en.h

@@ -58,6 +58,7 @@ static const char* const I18N_EN[] = {
     "Screen timeout: ",
     "Night dimming (10pm-6am): ",
     "Statistics",
+    "History chart",
     "Logbook files",
     "More settings >",
     "Emergency alert: ",
@@ -117,6 +118,10 @@ static const char* const I18N_EN[] = {
     "Tap again to confirm!",
     "Logbook data reset.",
     "Uptime: ",
+    "History (last 7 days)",
+    "No logbook entries yet.",
+    "How the history chart works",
+    "Shows the number of newly logged aircraft per day, for up to the last 7 days with logbook data. Bar height is relative to the busiest day shown - a taller bar means more aircraft were logged that day. The number above each bar is the exact count.",
 
     "Logbook files",
     "No logbook entries yet.",
@@ -124,6 +129,9 @@ static const char* const I18N_EN[] = {
     " of ",
     " days",
     " aircraft",
+    "Export via web browser",
+    "The device also runs a small web page for exporting the full logbook. While connected to the same WiFi network, open a browser and go to:",
+    "No WiFi connection - the export page is only reachable while connected to a network.",
 
     "Tap for details",