v1.2: Shift+Tab on soft keyboard + swap ASR to Qwen3-ASR-Flash

Two independent improvements from real-device testing:

1. Shift+Tab — softkb.c
   The 3DS soft keyboard's Tab key now respects the physical L (Shift)
   modifier.  Holding L while tapping Tab emits CSI Z ("\x1b[Z"), the
   terminal-standard escape sequence for "cursor backward tabulation"
   that most TUIs interpret as Shift+Tab — useful for reverse-cycling
   completions in vim/zsh, walking backwards through tmux panes after
   Ctrl-B q, and similar.

   Touch is two lines in the KIND_SEQ dispatch: when L is held AND the
   sequence is literally "\t", swap for "\x1b[Z" before returning.
   Plain Tab (no modifier) still emits "\t" unchanged.  Only "\t" is
   special-cased; other KIND_SEQ bindings pass through verbatim.

2. ASR model swap — tools/whisper_shim.py
   OPENROUTER_AUDIO_MODEL changed from "openai/whisper-large-v3-turbo"
   to "qwen/qwen3-asr-flash-2026-02-10".  Same JSON request / response
   shape on OpenRouter's /v1/audio/transcriptions endpoint, so no
   protocol or parsing changes.  Motivations:

   - User report: OpenRouter's Whisper Turbo provider occasionally
     blocks / rate-limits requests from certain IPs, where the same
     audio through Qwen ASR succeeds.
   - Qwen tends to emit more idiomatic Chinese punctuation
     ("你好，世界。" vs Whisper's "你好世界,").
   - Pinning the dated snapshot (2026-02-10) because OpenRouter does
     not expose an unpinned alias for this model.

   Pricing roughly 2× higher (~$0.13/audio-hour vs $0.067) but still
   negligible at personal-use volumes.

Both verified on real 3DS hardware before push.

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

Author: exdekotive

source/softkb.c

@@ -459,6 +459,14 @@ const char *softkb_touch(softkb_t *kb,
             kb->repeat_idx = -2;
             return NULL;
         case KIND_SEQ:
+            /* Shift + Tab = "cursor backward tabulation" (CSI Z) — the
+             * terminal-standard escape for shift-tab.  Catches the
+             * common case (only seq we currently bind is "\t"); other
+             * KIND_SEQ keys pass through verbatim. */
+            if (keyboard_shift_held(kbd) && k->seq
+                && k->seq[0] == '\t' && k->seq[1] == '\0') {
+                return "\x1b[Z";
+            }
             return k->seq;
         case KIND_SPACE:
             /* In CN mode with an active pinyin buffer, space commits

tools/whisper_shim.py

@@ -50,7 +50,16 @@
 SOCK_PATH     = "/tmp/dssh-whisper.sock"
 
 OPENROUTER_AUDIO_URL = "https://openrouter.ai/api/v1/audio/transcriptions"
-OPENROUTER_AUDIO_MODEL = "openai/whisper-large-v3-turbo"
+# Switched from openai/whisper-large-v3-turbo → qwen/qwen3-asr-flash-...
+# in v1.2 because OpenRouter's Whisper turbo provider occasionally
+# rate-limits / blocks requests from certain IP ranges, while the Qwen
+# ASR endpoint has been stable for the same audio.  Same JSON request
+# shape, same {text, usage} response shape — no protocol changes
+# needed.  Qwen also tends to emit better Chinese punctuation
+# ("你好，世界。" vs Whisper's "你好世界,").  Pricing is about 2× higher
+# but still negligible at personal-use volumes.  Pin the dated snapshot
+# because OpenRouter doesn't expose an unpinned alias.
+OPENROUTER_AUDIO_MODEL = "qwen/qwen3-asr-flash-2026-02-10"
 AUDIO_LANG = "zh"
 AUDIO_TIMEOUT_SEC = 30