feat(keybinds): capture region/screen to file

Add SHIFT+Print (region → file) and CTRL+Print (screen → file) next to
the existing bare Print (region → clipboard). Each saves a timestamped
PNG under ~/Pictures/Screenshots and toasts the path — the same grim/slurp
plumbing and directory the Capture menu's "→ file" rows already use.
Single-source keybinds.nix, so the SUPER+? cheatsheet lists both new rows.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

agent/BACKLOG.md

@@ -263,13 +263,6 @@ mime defaults (item 8's `xdg.mimeApps` surface) so audio/video files open
 in them. (mpv already the video default per HARDWARE-QUEUE — confirm and
 extend to audio; pick the audio player.)
 
-### 38. Capture-to-file keybinds
-(Raised by Bernardo, 2026-07-07 — item 8.) Add binds for "capture region
-→ file" and "capture screen → file" (distinct from the existing
-clipboard/recording capture flows), landing PNGs in ~/Pictures. Add to
-`keybinds.nix` (single source → Hyprland + the SUPER+? cheatsheet) and
-the Capture menu; reuse the existing grim/slurp plumbing.
-
 ### 41. Floating-window audit
 (Raised by Bernardo, 2026-07-07 — item 11.) Decide which windows should
 open floating by default (config dialogs, pavucontrol, file-chooser

agent/HARDWARE-QUEUE.md

@@ -236,6 +236,11 @@ QA machine), the **T14s** (webcam case).
       unchanged (the bar still reserves its space). Accepted trade-off
       of `layer: bottom`: a floating window dragged over the top strip
       can now overlap the bar — confirm that's the only regression.
+- [ ] **Capture-to-file keybinds** (iteration #59, item 38) — after
+      `home-update` + relogin: SHIFT+Print prompts a region select then
+      saves a PNG under ~/Pictures/Screenshots (toast shows the path);
+      CTRL+Print saves the whole screen the same way; bare Print still
+      copies a region to the clipboard. Both new rows appear in SUPER+?.
 - [ ] **rofi menu polish** (iteration #58, item 39 + #56/#57 34/40) —
       after `home-update`: (a) menu › System › Power profile shows a
       colored icon per profile (performance/balanced/power-saver), not

agent/JOURNAL.md

@@ -17,6 +17,19 @@ Template:
 
 ---
 
+## 2026-07-07 — Capture-to-file keybinds (iteration #59, item 38)
+- **Task:** BACKLOG item 38 — direct keybinds for region→file and
+  screen→file (the Capture *menu* already had both "→ file" rows).
+- **Fix:** `modules/home/keybinds.nix` — added `SHIFT+Print` (region→file)
+  and `CTRL+Print` (screen→file) alongside the existing bare `Print`
+  (region→clipboard). Each saves a timestamped PNG under
+  ~/Pictures/Screenshots and toasts the path — same grim/slurp plumbing +
+  dir the menu's "→ file" rows use. Single-source, so the SUPER+?
+  cheatsheet (rofi.nix reads the same list) gets both rows automatically.
+- **Verified:** V0 green. `nix eval` of the rendered binds confirms
+  `$HOME`/`$f`/`$(...)` pass through literally to the shell (no Nix
+  interpolation). Actual key-firing + file landing is a V3 check (queued).
+
 ## 2026-07-07 — rofi search mis-ranks + power-profile icons (iteration #58, items 31 & 39)
 - **#31 (rofi search broken):** Bernardo ran the live A/B — `-sorting-method
   normal` and `-matching normal` both fixed "steam"→Steam; `-no-sort` did