revert: drop the portal response timeout

Hyprland's portal shows its picker during SelectSources, so a timeout before
the picker step cut users off while choosing. A wedged portal backend looks
the same; recording stays in Waiting for capture and the app must prompt.

docs/validation.md

@@ -9,7 +9,7 @@ pass/fail results.
 | Where | Script | Status |
 | --- | --- | --- |
 | Linux, headless rig (Wayland portal + Xwayland) | `scripts/validate/linux-rig.sh` | All 9 scenarios pass on devbox (Intel UHD 770, VA-API) |
-| Linux, real session (CachyOS, Hyprland, RX 9070 XT, 1440p60) | `scripts/validate/linux-hardware.sh` | 2026-10-08: H.264, HEVC and AV1 usable; restore token works; portal stall fix awaiting re-run |
+| Linux, real session (CachyOS, Hyprland, RX 9070 XT, 1440p60) | `scripts/validate/linux-hardware.sh` | 2026-10-08: H.264, HEVC and AV1 usable; restore token works |
 | Windows (Game Capture, NVENC/AMF/QSV) | `scripts/validate/windows.ps1` | Not run yet; script untested |
 
 ## Probe commands
@@ -81,11 +81,14 @@ CachyOS 7.2.9, Hyprland, RX 9070 XT, 1440p60, OBS 32.0.4:
 
 - The restore token works: the restored run started recording in 2 s without
   showing the picker.
-- The portal stalled silently on one run again: it created the session but
-  never answered `SelectSources`, before any picker. Recording now fails if
-  the portal has not reached its picker 10 s after the request
-  (`StatusTracker::PORTAL_RESPONSE_LIMIT`); time spent in the picker itself
-  is not limited.
+- Hyprland's portal backend (xdg-desktop-portal-hyprland) wedged in
+  `SelectSources` during this run and answered nothing afterwards, until
+  restarted; the earlier "no selection" runs were likely the same hang.
+  xdph shows its picker during `SelectSources`, so a hang there looks the same
+  as a user still choosing. A 10 s timeout tried in afc54b3 would cut users
+  off mid-pick and was removed. Recording stays honestly in `Waiting for
+  capture`; the app needs a prompt to choose a source (or restart the portal)
+  while it waits.
 - The motion check sampled a segment from before capture started (the user
   took 16 s in the picker); it now uses the segment with the most motion.
 - A portrait monitor (Hyprland transform 3) is captured as 1440x2560 and