feat(copy): PR 1.1 — research-grounded copy + prompt corrections

Add cue-anchored "When [cue], [action]" framing to the task-decomposition
prompt where natural cues are present (Gollwitzer-style implementation
intentions, d=0.65 effect size). Soften Bionic Reading and accessibility-
font copy to honest preference framing per the v3 audit (Strukelj 2024;
Doyon n=2,074). Update timer nudge from "Still on that timer?" (which
read as judgmental) to "Timer's still running." Replace stale Tasks
page header copy promising automatic extraction.

Audio envelopes (focusTimer 20ms ramp, sounds.ts 10ms attack) verified
correct per memo §B; no code change needed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/stores/nudgeBus.svelte.ts

@@ -160,7 +160,7 @@ function checkInactivityWithActiveTimer(now: number) {
   if (now - blurredAt < INACTIVITY_TIMER_THRESHOLD_MS) return;
   timerNudgeFiredThisSession = true;
   void deliver(
-    "Still on that timer?",
+    "Timer's still running.",
     "It's been ticking while you've been away. Pick up where you left off, or stop it.",
   );
 }