Fix SGR mouse release button + reflow wrapped lines on resize

- SGR (1006) release events now carry the same button number as the
  press ('m' suffix marks release); the legacy 'button 3 = release'
  is only used for X10/UTF8 encodings. ncurses apps (htop etc.) could
  not pair press+release before, so clicks were ignored while scroll
  (press-only wheel events) worked
- Each window keeps its recent raw PTY output (capped at 512 KB); on
  resize the history is replayed into a fresh parser at the new width
  so long lines re-wrap correctly instead of keeping old break points
- Integration: release-button and reflow checks, 33/33 passing

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/integration.py

@@ -198,6 +198,11 @@ def main():
         text = disp.frame_text(timeout=5.0, contains="[<0;")
         check("musklick forwardas som SGR till PTY", "[<0;" in text,
               f"frame-text: {text[-200:]!r}")
+        # Släppet ska bära SAMMA knappnummer med 'm'-suffix (SGR), inte
+        # legacy-koden 3 — annars registrerar ncurses-appar inga klick.
+        text = disp.frame_text(timeout=5.0, contains="[<0;4;3m")
+        check("mus-släpp forwardas med korrekt knappnummer", "[<0;4;3m" in text,
+              f"frame-text: {text[-200:]!r}")
 
         # Scroll ska också forwardas (SGR-knapp 64/65)
         disp.send(mouse_event("ScrollDown", cx, cy))
@@ -247,6 +252,30 @@ def main():
               f"frame-tail: {text[-200:]!r}")
         app.send({"type": "close_window", "window_id": rz_open["id"]})
 
+        # ── 4b3. Reflow: långa rader radbryts om efter resize ────────────
+        long = "A" * 90
+        app.send({"type": "spawn_window",
+                  "command": f"printf '{long}\\n'; exec cat",
+                  "request_id": "w-reflow"})
+        rf_open = app.recv_until("window_opened")
+        disp.frame_text(timeout=5.0, contains="AAAA")
+        app.send({"type": "list_windows", "request_id": "lrf"})
+        wrf = next(w for w in app.recv_until("window_list")["windows"]
+                   if w["id"] == rf_open["id"])
+        # 90 A på 80 kolumner bred terminal → raden är bruten
+        text = disp.frame_text(timeout=2.0)
+        check("lång rad är bruten före resize", long not in text)
+        # dra nedre högra hörnet så innehållet blir ≥ 90 kolumner brett
+        cx0, cy0 = wrf["x"] + wrf["width"] - 1, wrf["y"] + wrf["height"] - 1
+        grow = 94 - (wrf["width"] - 2)
+        disp.send(mouse_event({"Down": "Left"}, cx0, cy0))
+        disp.send(mouse_event({"Drag": "Left"}, min(cx0 + grow, 99), cy0))
+        disp.send(mouse_event({"Up": "Left"}, min(cx0 + grow, 99), cy0))
+        text = disp.frame_text(timeout=5.0, contains=long)
+        check("raden radbryts om (reflow) efter resize", long in text,
+              f"bredd efter: {wrf['width']}+{grow}")
+        app.send({"type": "close_window", "window_id": rf_open["id"]})
+
         # ── 4c. Scrollback: mushjul utan mus-tracking scrollar historiken ─
         app.send({"type": "spawn_window",
                   "command": "seq 1 200; exec cat",