feat(BaseUI): show 'GPS Time Only' when GNSS has time but no position fix (#11361)

The position frame's drawGpsCoordinates() only distinguished 'No GPS
present' / 'No GPS Lock' / coordinates, so a GNSS that had decoded
valid time but no fix displayed identically to a cold chip.

- GPSStatus: add per-acquisition hasTime flag (5th ctor param,
  accessor, matches() term, updateStatus() copy)
- GPS::runOnce(): publish immediately on the gotTime rising edge so
  the flag reaches observers on the time-only path, which previously
  never published; done directly rather than via the end-of-loop
  block so fixHoldEnds is preserved and hold/power behavior is
  unchanged. Safe without a location: PositionModule ignores invalid
  positions. gotTime is already cleared on each GPS_ACTIVE entry, so
  the state is not sticky across acquisitions.
- UIRenderer::drawGpsCoordinates(): the 'No GPS Lock' line becomes
  'GPS Time Only' when time is valid.

The drawGps() header renderer is intentionally untouched (its
branches need separate de-clobbering work).


Claude-Session: https://claude.ai/code/session_01CcrasD4QsatunDreANDgCx

Co-authored-by: Claude <noreply@anthropic.com>

src/graphics/draw/UIRenderer.cpp

@@ -582,7 +582,7 @@ void UIRenderer::drawGpsCoordinates(OLEDDisplay *display, int16_t x, int16_t y,
         }
     } else if (!gps->getHasLock() && !config.position.fixed_position) {
         if (strcmp(mode, "line1") == 0) {
-            strcpy(displayLine, "No GPS Lock");
+            strcpy(displayLine, gps->getHasTime() ? "GPS Time Only" : "No GPS Lock");
             display->drawString(x, y, displayLine);
         }
     } else {