Scalable assets, zoom/pan, monthly grouping, and scroll stability

- Dynamic arrays for assets (remove 1000/500 caps)
- Zoom (R/L triggers) and pan (analog stick) in detail view
- Group gallery by month/year with headers
- Fix fast-scroll crashes via texture pooling and thread safety
- Serialize curl calls (OpenSSL 1.0.2 lacks thread support)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

goals.md

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+# vitaImmich — Goals
+
+Task list for the current round of work. Checked items are done.
+
+## 1. Make asset/local storage scalable (remove 1000 / 500 caps)
+- [x] Replace fixed `MAX_ASSETS` (1000) server-asset arrays with dynamically
+      grown (realloc, doubling) arrays.
+- [x] Replace fixed `MAX_LOCAL` (500) local-media arrays with dynamically grown
+      arrays (grown during the startup scan, fixed afterward).
+- [x] Replace the fixed `g_disp[DISP_MAX]` merged-timeline array with a grown
+      array.
+- [x] Decouple the thumbnail worker thread from the growable arrays (pass the
+      request id/path through dedicated buffers) so a realloc on the main
+      thread can never dangle a pointer the worker is reading.
+
+## 2. Zoom and pan in the image viewer
+- [x] Enable analog-stick sampling.
+- [x] R trigger zoom in / L trigger zoom out in the detail view.
+- [x] Left stick pans when zoomed in; pan is clamped to the image bounds.
+- [x] Zoom/pan reset when moving to another photo; browsing left/right is
+      disabled while zoomed.
+
+## 3. Group the gallery by month and year
+- [x] Compute a grid layout with section headers inserted whenever the
+      month/year of the (date-sorted) timeline changes.
+- [x] Draw "Month YYYY" headers; render items under the right header.
+- [x] Scroll, selection-follow, visible-range and thumb eviction all use the
+      computed per-item positions.
+
+## 4. Show more relevant info in the SELECT (sync) menu
+- [x] Photo vs video breakdown for server + local.
+- [x] Total local media size, backed-up size and percentage.
+- [x] Details for the currently selected item (name, date, size, state).
+
+## 5. Fix the fast-scroll crash (pre-existing, reproduced in Vita3K)
+- [x] Root cause: freeing a thumbnail texture unmaps its memblock while the
+      GPU side (Vita3K's texture cache re-reads guest memory of cached
+      textures) may still touch it — random-looking crashes deep in OpenSSL /
+      libjpeg / strlen whenever eviction ran during a scroll. Fixed by
+      recycling thumbnails through a texture pool (`tex_acquire`/`tex_release`)
+      instead of ever freeing them mid-run.
+- [x] Pace the main loop with `sceDisplayWaitVblankStart()` — without it the
+      loop free-runs in the emulator, racing the held d-pad into a page-fetch
+      storm (30+ requests/second against the server).
+- [x] Suspend thumbnail loads/eviction and page fetches while the selection is
+      still moving (`scrolling_fast` settle counter).
+- [x] Serialize all `curl_easy_perform` calls behind one mutex — vitasdk's
+      OpenSSL 1.0.2 is built without thread support, so concurrent TLS from
+      the main/worker/sync threads is unsafe (also installed OpenSSL locking
+      callbacks for defense in depth).
+- [x] Pre-grow the newlib heap (96 MB, trim disabled) at boot so heap
+      memblock mapping never happens while multiple threads run.
+- [x] Verified: repeated 10–12 s held-scroll cycles to photo 1780+ across
+      multiple pages, zero GPU faults / zero crashes (previous builds died
+      within ~10 s).