chore: bump minimum Python from 3.8 to 3.9 (#336)

* chore: bump minimum Python from 3.8 to 3.9 and adopt PEP 585 builtins

- Update requires-python, classifiers, mypy target, and black target in pyproject.toml
- Replace Python 3.8 with 3.9 in CI matrix and nightly workflow
- Replace typing.List/Dict/Tuple/Set with builtin list/dict/tuple/set (PEP 585)
- Update all 3.8 version references in README, docs, website, and install.sh
- Fix test_wayland_no_tools to mock IBus availability
- Remove List from common_types re-exports and update test

* style: reformat test files for Black 26.x and pin version in CI

Black 26.x introduced parenthesized context manager formatting.
Reformat 7 test files and pin Black>=26,<27 in CI to prevent
future drift from unpinned version upgrades.

web/src/app/faq/page.tsx

@@ -20,7 +20,7 @@ const faqCategories = [
       },
       {
         q: "What are the system requirements?",
-        a: "You need Python 3.8+, a working microphone, and about 500MB of disk space. For GPU acceleration with whisper.cpp, you need Vulkan support (AMD, Intel, or NVIDIA).",
+        a: "You need Python 3.9+, a working microphone, and about 500MB of disk space. For GPU acceleration with whisper.cpp, you need Vulkan support (AMD, Intel, or NVIDIA).",
       },
     ],
   },

web/src/app/install/[distro]/page.tsx

@@ -37,8 +37,8 @@ const distroConfig: Record<DistroSlug, DistroConfig> = {
     intro:
       "This Ubuntu guide is tuned for practical desktop use: terminals, browsers, IDEs, office suites, and chat apps. Vocalinux runs locally so your voice data never leaves your machine.",
     prerequisites: [
-      "Ubuntu 22.04+ (or Ubuntu-based distro)",
-      "Python 3.8+",
+       "Ubuntu 22.04+ (or Ubuntu-based distro)",
+       "Python 3.9+",
       "Working microphone",
       "curl installed (sudo apt update && sudo apt install -y curl)",
     ],
@@ -68,8 +68,8 @@ const distroConfig: Record<DistroSlug, DistroConfig> = {
     intro:
       "Fedora is an excellent match for Vocalinux thanks to current Python stacks and up-to-date system libraries. This guide focuses on reliable setup and minimal friction.",
     prerequisites: [
-      "Fedora Workstation 39+ (or Fedora-based distro)",
-      "Python 3.8+",
+       "Fedora Workstation 39+ (or Fedora-based distro)",
+       "Python 3.9+",
       "Working microphone",
       "curl installed (sudo dnf install -y curl)",
     ],
@@ -99,8 +99,8 @@ const distroConfig: Record<DistroSlug, DistroConfig> = {
     intro:
       "Arch users usually care about control and performance. This guide keeps setup lean while preserving compatibility across rolling-release desktop environments.",
     prerequisites: [
-      "Arch Linux / Manjaro / EndeavourOS",
-      "Python 3.8+",
+       "Arch Linux / Manjaro / EndeavourOS",
+       "Python 3.9+",
       "Working microphone",
       "curl installed (sudo pacman -Sy --needed curl)",
     ],

web/src/app/page.tsx

@@ -858,7 +858,7 @@ export default function HomePage() {
                 </h4>
                 <ul className="space-y-2 text-sm text-muted-foreground">
                   <li>• Ubuntu 22.04+ (or equivalent)</li>
-                  <li>• Python 3.8 or newer</li>
+                  <li>• Python 3.9 or newer</li>
                   <li>• 4GB RAM (8GB for large models)</li>
                   <li>• Microphone</li>
                   <li>• X11 or Wayland display server</li>
@@ -1134,7 +1134,7 @@ export default function HomePage() {
                 question: "What are the system requirements?",
                 answer: (
                   <>
-                    Minimum: 4GB RAM, Python 3.8+, ~200MB disk space. 8GB+ RAM recommended for larger Whisper models. The default whisper.cpp tiny model (~39MB) works great on modest hardware. GPU acceleration is available via Vulkan for AMD, Intel, and NVIDIA GPUs.{" "}
+                    Minimum: 4GB RAM, Python 3.9+, ~200MB disk space. 8GB+ RAM recommended for larger Whisper models. The default whisper.cpp tiny model (~39MB) works great on modest hardware. GPU acceleration is available via Vulkan for AMD, Intel, and NVIDIA GPUs.{" "}
                     <Link href="/install/" className="text-primary hover:underline">View full installation requirements</Link>.
                   </>
                 ),

web/src/app/troubleshooting/page.tsx

@@ -11,7 +11,7 @@ const troubleshootingItems = [
     solutions: [
       "Ensure you ran the installer: curl -fsSL https://raw.githubusercontent.com/jatinkrmalik/vocalinux/main/install.sh | bash",
       "Check if the virtual environment is activated: source ~/.local/share/vocalinux/venv/bin/activate",
-      "Verify Python version (3.8+ required): python3 --version",
+      "Verify Python version (3.9+ required): python3 --version",
       "Try reinstalling: ./uninstall.sh && ./install.sh",
     ],
   },