feat(install): rr on PATH for all shells + post-install version checks + headless --version

[filipeforattini]

Three install/CLI ergonomics fixes that fell out of the Ubuntu-22 glibc black-screen debugging.

1. Headless red-request --version / -V (Rust)

red-request is a Tauri GUI app and resolve_db_target() ignores any arg starting with -, so red-request --version previously launched the app instead of printing a version. Added an early check in run() that prints red-request <version> and exits before the GUI is built — so installers (and users) can verify the binary headlessly.

2. Post-install verification (install.sh)

New verify_install() runs at the end of every install path and prints:

• red-request --version
• red --version

This surfaces a broken sidecar (e.g. a glibc-incompatible red — the exact failure behind the black screen) at install time, instead of as a blank window on first launch. If red fails to run it prints the error + how to recover (--force). Guarded with timeout so an older binary that predates the --version handler can't hang the installer.

3. rr reliably on PATH — including fish

• .deb: the rr shortcut is now a symlink in /usr/local/bin (on PATH for bash/zsh/fish out of the box, no rc-file edits) instead of ~/.local/bin, which needed PATH wiring.
• AppImage + fish: rc_file() / ensure_path() now handle fish (~/.config/fish/config.fish + fish_add_path). They previously wrote a bash export PATH=… into ~/.profile, which fish never reads — so rr never landed on PATH for fish users (the reporter runs bash/zsh/fish on the affected machine).
• uninstall.sh: removes the /usr/local/bin/rr symlink (sudo) and strips the PATH block from config.fish too.

Verification (local)

• bash -n install.sh uninstall.sh clean.
• cargo fmt --all --check clean; cargo check compiles (the --version handler type-checks). CI only runs cargo fmt, so the compile was verified locally.

Notes

• red is bundled in the package, so a red-request upgrade already replaces /usr/bin/red; this PR adds the verification that it actually runs, plus the --force hint for the same-version-but-broken edge case.
• Independent of the fonts PR (fix(ui): lock bundled Inter + Fira Code so fonts render consistently cross-OS #67) and the static-sidecar fix (fix(release): fetch static (musl) reddb sidecar to fix glibc black screen #66, shipped in v0.22.1).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 92021208-de90-486b-922b-0fa4cce58765

📥 Commits

Reviewing files that changed from the base of the PR and between 5e478aa and 02f2b05.

📒 Files selected for processing (3)

• apps/desktop/src-tauri/src/lib.rs
• install.sh
• uninstall.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent/install-verify-version

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