chore(release): bump version to 1.2.6 + release notes

Bumped:
- src-tauri/Cargo.toml + Cargo.lock
- src-tauri/tauri.conf.json
- package.json + package-lock.json
- snapcraft.yaml
- flake.nix (qbzVersion, hashes cleared for nix users to regenerate)

Added:
- packaging/flatpak/com.blitzfc.qbz.metainfo.xml (1.2.6 entry)
- docs/release-1.2.6/TAG_DETAILS.md (release notes)

cc

docs/release-1.2.6/TAG_DETAILS.md

@@ -0,0 +1,40 @@
+# 1.2.6 — Accessibility patch
+
+A small follow-up on the heels of 1.2.5 driven by user reports. Accessibility takes the front seat: four new WCAG-compliant themes (including a true high-contrast mode), mouse-drag scrolling on every horizontal album row, and a Qobuz Connect badge that no longer disappears when the queue is empty. Two regressions are also fixed, including Infinite Play stopping at the end of the queue.
+
+---
+
+## Accessibility
+
+- **Four new WCAG-compliant themes** in Settings > Appearance > Theme:
+  - **WCAG Light** — AAA contrast (7:1+) on every text level, blue accent
+  - **WCAG Dark** — AAA contrast on dark backgrounds
+  - **High Contrast** — pure white on pure black with yellow accent (21:1 contrast). Built explicitly for severely vision-impaired users
+  - **Colorblind** — deuteranopia-safe palette (Wong colors), no red/green adjacency
+- **Horizontal album rows now support mouse drag** — click and drag sideways on Home, For You, Award and Label views, just like on iPad or in a browser. Arrow buttons still work as before
+- **Qobuz Connect badge always visible** — even with an empty queue (e.g. on app start) you can connect to a remote renderer instead of having to start playing something first
+
+---
+
+## Regression fixes
+
+- **Infinite Play (∞ in the queue) restored** — the toggle now persists across restarts and refills the queue with related tracks (Qobuz `/radio/artist`, seeded from your last played tracks) when the queue ends, instead of stopping. V2 reimplementation, no legacy wrappers
+- **Gentoo binary package** — `qbz-bin` ebuild now correctly inherits `xdg-utils`, so the hicolor icon cache and the desktop database are refreshed on install/uninstall. This was the cause of stale icons after upgrading to 1.2.5
+
+---
+
+## Branding polish
+
+- **App icon resized to fill the canvas** (matches Steam/Chrome/Papirus footprint, ~97%) with a subtle blue rim and inner highlight so the matte-vinyl disc doesn't disappear on dark backgrounds; new 512x512 PNG export added for distros that prefer it
+
+---
+
+## Issues addressed
+
+- #318 — Toggle on/Enable Qobuz Connect when the player controls are not visible
+- #319 — Infinite Play doesn't queue new tracks
+- discussion #313 — accessibility / drag-to-scroll requests from a vision-impaired user
+
+---
+
+Saludos a todos y muchas gracias.