feat: Add complete async audio transcription workflow

Implemented full transcription system with local Whisper and OpenAI API
support. Includes comprehensive test suite (60 tests) and reorganized
keybindings for better discoverability.

Features:
- Async transcription (non-blocking workflow)
- Desktop notifications (started/complete/error)
- Output: audio.txt (transcript) + audio.log (process logs)
- Modeline integration showing active transcription count
- Dired integration (press T on audio files)
- Process management and tracking

Scripts:
- install-whisper.sh: Install Whisper via AUR or pip
- uninstall-whisper.sh: Clean removal with cache cleanup
- local-whisper: Offline transcription using installed Whisper
- oai-transcribe: Cloud transcription via OpenAI API

Tests (60 passing):
- Audio file detection (16 tests)
- Path generation logic (11 tests)
- Log cleanup behavior (5 tests)
- Duration formatting (9 tests)
- Active counter & modeline (11 tests)
- Integration workflows (8 tests)

Keybindings:
- Reorganized gcal to C-; g submenu (s/t/r/c)
- Added C-; t transcription submenu (t/b/k)
- Dired: T to transcribe file at point

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

1 files changed, 83 insertions, 0 deletions

diff --git a/tests/test-transcription-audio-file.el b/tests/test-transcription-audio-file.el
new file mode 100644
index 00000000..f40d9ca6
--- /dev/null
+++ b/tests/test-transcription-audio-file.el
@@ -0,0 +1,83 @@
+;;; test-transcription-audio-file.el --- Tests for audio file detection -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Tests for cj/--audio-file-p function
+;; Categories: Normal cases, Boundary cases, Error cases
+
+;;; Code:
+
+(require 'ert)
+(require 'transcription-config)
+
+;; ----------------------------- Normal Cases ----------------------------------
+
+(ert-deftest test-cj/--audio-file-p-m4a ()
+  "Test that .m4a files are recognized as audio."
+  (should (cj/--audio-file-p "meeting.m4a")))
+
+(ert-deftest test-cj/--audio-file-p-mp3 ()
+  "Test that .mp3 files are recognized as audio."
+  (should (cj/--audio-file-p "podcast.mp3")))
+
+(ert-deftest test-cj/--audio-file-p-wav ()
+  "Test that .wav files are recognized as audio."
+  (should (cj/--audio-file-p "recording.wav")))
+
+(ert-deftest test-cj/--audio-file-p-flac ()
+  "Test that .flac files are recognized as audio."
+  (should (cj/--audio-file-p "music.flac")))
+
+(ert-deftest test-cj/--audio-file-p-with-path ()
+  "Test audio file recognition with full path."
+  (should (cj/--audio-file-p "/home/user/recordings/meeting.m4a")))
+
+;; ----------------------------- Boundary Cases --------------------------------
+
+(ert-deftest test-cj/--audio-file-p-uppercase-extension ()
+  "Test that uppercase extensions are recognized."
+  (should (cj/--audio-file-p "MEETING.M4A")))
+
+(ert-deftest test-cj/--audio-file-p-mixed-case ()
+  "Test that mixed case extensions are recognized."
+  (should (cj/--audio-file-p "podcast.Mp3")))
+
+(ert-deftest test-cj/--audio-file-p-no-extension ()
+  "Test that files without extension are not recognized."
+  (should-not (cj/--audio-file-p "meeting")))
+
+(ert-deftest test-cj/--audio-file-p-empty-string ()
+  "Test that empty string is not recognized as audio."
+  (should-not (cj/--audio-file-p "")))
+
+(ert-deftest test-cj/--audio-file-p-dotfile ()
+  "Test that dotfiles without proper extension are not recognized."
+  (should-not (cj/--audio-file-p ".hidden")))
+
+(ert-deftest test-cj/--audio-file-p-multiple-dots ()
+  "Test file with multiple dots but audio extension."
+  (should (cj/--audio-file-p "meeting.2025-11-04.final.m4a")))
+
+;; ------------------------------ Error Cases ----------------------------------
+
+(ert-deftest test-cj/--audio-file-p-not-audio ()
+  "Test that non-audio files are not recognized."
+  (should-not (cj/--audio-file-p "document.pdf")))
+
+(ert-deftest test-cj/--audio-file-p-text-file ()
+  "Test that text files are not recognized as audio."
+  (should-not (cj/--audio-file-p "notes.txt")))
+
+(ert-deftest test-cj/--audio-file-p-org-file ()
+  "Test that org files are not recognized as audio."
+  (should-not (cj/--audio-file-p "tasks.org")))
+
+(ert-deftest test-cj/--audio-file-p-video-file ()
+  "Test that video files are not recognized as audio."
+  (should-not (cj/--audio-file-p "video.mp4")))
+
+(ert-deftest test-cj/--audio-file-p-nil ()
+  "Test that nil input returns nil."
+  (should-not (cj/--audio-file-p nil)))
+
+(provide 'test-transcription-audio-file)
+;;; test-transcription-audio-file.el ends here