Fix "Show next" staleness bug; add location/date/share-QR to manage overlay

Two changes, bundled since they landed in the same session and touch
overlapping files:

1. Fix: "Show next" sent the browser's full queue snapshot to
   POST /api/queue/reorder, which hard-rejected if the server's queue
   had shifted since the last fetch (e.g. right after a queue-length
   trim). New POST /api/queue/promote moves one photo to the front
   authoritatively, with no dependency on client staleness. /reorder
   itself is now tolerant too -- unrecognized IDs are dropped and
   missing ones appended, instead of rejecting the whole request.

2. Feature: the manage button's overlay now also shows the photo's
   location (top-left, only if Immich reverse-geocoded it from GPS
   EXIF), the date it was taken (bottom-right), and a QR code (bottom-
   left) linking to a 30-minute public Immich share link -- created
   lazily when someone actually scans it, not when the button's
   pressed. New server endpoints GET /frame/photo-info and
   GET /frame/share/{asset_id} (scoped to the frame's current/queued
   photos, not any arbitrary Immich asset). Firmware-side, the overlay
   mechanism generalizes from one spliced region to up to four
   (manage_qr_overlay.c), each its own small buffer, still never
   holding the full frame in RAM.

firmware/main/manage_qr_overlay.h

@@ -4,19 +4,38 @@
 
 #include "esp_err.h"
 
+#define MANAGE_OVERLAY_MAX_REGIONS 4
+
 typedef struct {
-    uint8_t *buf; /* malloc'd (w/2)*h bytes, packed 2px/byte; caller must free */
+    uint8_t *buf; /* malloc'd (w/2)*h bytes, packed 2px/byte; owned by the region */
     int x0, y0;   /* top-left corner, panel pixel coordinates (x0 is always even) */
     int w, h;     /* pixel dimensions (w is always even) */
-} manage_qr_overlay_t;
+} manage_overlay_region_t;
+
+typedef struct {
+    manage_overlay_region_t regions[MANAGE_OVERLAY_MAX_REGIONS];
+    int count;
+} manage_overlay_set_t;
+
+typedef struct {
+    const char *management_url; /* top-right QR + "SCAN TO"/"MANAGE" caption -- always shown */
+    const char *location;       /* top-left text; NULL/empty skips this region */
+    const char *taken_at;       /* bottom-right text; NULL/empty skips this region */
+    const char *share_url;      /* bottom-left QR (no caption); NULL/empty skips this region */
+} manage_overlay_content_t;
 
 /**
- * Renders a small "scan to manage" overlay -- a QR code encoding
- * management_url plus a "SCAN TO" / "MANAGE" caption, on a white
- * padded background -- into a freshly allocated buffer sized just for
- * the overlay itself (not a full EPD_FRAME_BYTES frame), positioned for
- * the panel's top-right corner. Caller must call manage_qr_overlay_free().
+ * Renders the manage-button overlay: always a "scan to manage" QR in the
+ * top-right corner, plus whichever of location/taken_at/share_url are
+ * non-NULL/non-empty in their own corners (top-left, bottom-right,
+ * bottom-left respectively). Each region is its own separately malloc'd
+ * small buffer (not a full EPD_FRAME_BYTES frame). A failure rendering
+ * the top-right region fails the whole call; a failure rendering one of
+ * the optional regions just skips that region and keeps going. Caller
+ * must call manage_overlay_free() on out regardless of the return value
+ * (out->count reflects however many regions were actually populated).
  */
-esp_err_t manage_qr_overlay_render(const char *management_url, manage_qr_overlay_t *out);
+esp_err_t manage_overlay_render(const manage_overlay_content_t *content, manage_overlay_set_t *out);
 
-void manage_qr_overlay_free(manage_qr_overlay_t *overlay);
+/** Frees every populated region's buffer in overlay. */
+void manage_overlay_free(manage_overlay_set_t *overlay);