Hold a key, speak, and the words are typed

Super+D holds the microphone open, releasing it transcribes on the GPU and
types the result wherever the cursor is. Roughly 150ms for a normal utterance
once the model is resident, measured rather than hoped for.

Getting there meant discarding two approaches. Fedora 44 cannot install any
GPU-capable Whisper for Python -- openai-whisper needs a numba that needs an
llvmlite that does not exist for 3.14, and faster-whisper needs a ctranslate2
nobody packaged. The whisper-cpp package IS built with HIP but ships libraries
with no binary and no bindings, and hand-writing ctypes for a large by-value
struct is a segfault waiting for a version bump. So a container, as suggested.

Vulkan rather than ROCm, and upstream's image rather than one built here. ROCm
is seven gigabytes and serves AMD alone; Vulkan compute runs on the AMD, Intel
and NVIDIA machines this config is used on, in a twentieth of the space. The
Vulkan tag already contains whisper-server, so there is no Containerfile to keep
working -- an earlier draft of this commit had one, and it was strictly worse.

Two bugs found by using it rather than by reading it. Whisper describes silence
as the literal text "[BLANK_AUDIO]", and the first working version pasted that
string into the clipboard; a transcription that is nothing but such markers is
now discarded. And the server answers with a line per segment, which typed into
a window is an Enter press -- sending the half-written message, submitting the
form. Whitespace is collapsed to one line.

Neither the image nor the model is installed by ./install. Together they are
over two gigabytes that want the network, and Settings offers both as one
action instead. Nothing starts at login either: whisper-server holds the model
from the moment it starts, so the first press of the key is what brings it up.

The contract pins both text bugs, that the server stays on loopback, and that it
does not start at login. Reverting the [BLANK_AUDIO] guard did not fail it at
first -- the check was still correct, it had simply stopped being called -- so
it now checks the call site too.

Claude-Session: https://claude.ai/code/session_01Q84axqUE5inJhf5Jz9CFy1

config/dot/hypr/keybinds.lua

@@ -34,6 +34,10 @@ local osd = function(action)
     return "$HOME/.config/quickshell/scripts/panama-osd " .. action
 end
 
+local dictate = function(action)
+    return "$HOME/.config/quickshell/scripts/panama-dictate " .. action
+end
+
 -- Quickshell IPC targets. See quickshell/shell.qml for the handlers.
 local qs = function(target, fn) return "qs ipc call " .. target .. " " .. fn end
 
@@ -293,6 +297,26 @@ bind("XF86AudioLowerVolume", hl.dsp.exec_cmd(osd("volume down 6")), { locked = t
 bind("XF86AudioMute", hl.dsp.exec_cmd(osd("volume toggle")), { locked = true , description = "Mute" })
 bind("XF86AudioMicMute", hl.dsp.exec_cmd(osd("microphone toggle")), { locked = true , description = "Mute microphone" })
 
+-- ── Dictation ───────────────────────────────────────────────────────────────
+--
+-- Hold to talk, exactly like push-to-talk anywhere else: the mic is open only
+-- while the key is down, so it cannot be left listening by forgetting about it.
+-- Two binds on one chord, the second flagged `release`.
+--
+-- No `repeating`: holding a key normally repeats the press, which would restart
+-- the recording several times a second. The daemon refuses a second start while
+-- one is running, so a repeat would be harmless -- but not asking for it is
+-- better than relying on being refused.
+bind(mod .. " + D", hl.dsp.exec_cmd(dictate("start")),
+    { description = "Dictate (hold to talk)" })
+bind(mod .. " + D", hl.dsp.exec_cmd(dictate("stop")),
+    { release = true, description = "Dictate (transcribe on release)" })
+
+-- Escape out of a recording without transcribing it. Bound to the same modifier
+-- so it can be reached with the dictation key still held.
+bind(mod .. " + SHIFT + D", hl.dsp.exec_cmd(dictate("cancel")),
+    { description = "Cancel dictation" })
+
 -- Fine-grained steps, matching GNOME's shift/alt volume modifiers.
 bind("SHIFT + XF86AudioRaiseVolume", hl.dsp.exec_cmd(osd("volume up 1")), { locked = true, repeating = true , description = "Volume up (fine)" })
 bind("SHIFT + XF86AudioLowerVolume", hl.dsp.exec_cmd(osd("volume down 1")), { locked = true, repeating = true , description = "Volume down (fine)" })