Fix: Use latest release tag for install commands (#74)

* fix: Use latest release tag for install commands instead of main branch

The web install commands previously pointed to install.sh from the main branch,
which could be unstable/untested code. Now they dynamically fetch the latest
release tag from GitHub API and use that for the install script URLs.

Changes:
- Add getInstallCommands() function that takes a release tag
- Add latestRelease state that fetches from GitHub releases API
- Update all install commands to use the fetched release tag
- Fallback to 'main' if GitHub API fails

* docs: Update README and docs to use latest release tag

Also update GitHub release workflow to use the release tag dynamically.

Changes:
- README.md: Update install commands to use v0.3.0-alpha tag
- docs/INSTALL.md: Update install command to use v0.3.0-alpha tag
- .github/workflows/release.yml: Use ${{ github.ref_name }} for install URL
- Add note pointing to GitHub Releases for latest version

---------

Co-authored-by: Claude Opus <noreply@anthropic.com>

docs/INSTALL.md

@@ -7,9 +7,11 @@ This guide provides detailed instructions for installing Vocalinux on Linux syst
 ### One-liner Installation (Recommended)
 
 ```bash
-curl -fsSL https://raw.githubusercontent.com/jatinkrmalik/vocalinux/main/install.sh | bash
+curl -fsSL https://raw.githubusercontent.com/jatinkrmalik/vocalinux/v0.3.0-alpha/install.sh | bash
 ```
 
+> **Note**: Installs the latest stable release. For the most recent version, check [GitHub Releases](https://github.com/jatinkrmalik/vocalinux/releases).
+
 That's it! The installer handles everything automatically, including Whisper AI support.
 
 > ⏱️ **Note**: Installation takes ~5-10 minutes due to Whisper AI dependencies.