feat(deps): add Optional/Terminal Emulator tiers, fix docker prompt hang and ov install path

Reworks fish-deps' dependency classification from three tiers to five:
Required, Recommended, Optional, Terminal Emulators, and Integrations.

- Add an Optional tier for single-purpose wrapper conveniences that only
  matter if you already use that specific tool (btop, dust, duf,
  prettyping, go, lazygit, lazydocker, docker, yt-dlp, screen). Skipped by
  `fish-deps install`/`sync` by default.
- Split kitty/wezterm into their own Terminal Emulators tier, since only
  the one matching $TERM is ever relevant to a given user.
- Add --optional, --terminals, and --all flags to `install`/`sync` to
  opt back into the skipped tiers, with a summary of how many were
  skipped and which flag restores them.
- Fix `_fish_deps_status` marking missing Integrations as critical (red)
  the same as Required — only Required is red now; Recommended stays
  yellow, everything else renders as a neutral dim note.

Also fixes two bugs surfaced during dependency testing on a fresh
install:

- `fish_right_prompt` called `docker context show` on every prompt with
  no `type -q docker` guard, unlike every other optional integration in
  this config — on a system without docker this printed a visible
  "Unknown command: docker" block on every single prompt render. Added
  the missing guard, and hardened the `ld` wrapper with explicit
  docker/lazydocker presence checks.
- `ov`'s catalog entry offered `cargo install ov` as its preferred
  install method, but crates.io's `ov` is an unrelated crate, not the
  noborus/ov pager — cargo would silently install the wrong package.
  Removed the cargo path; `ov` now prefers `go install
  github.com/noborus/ov@latest` (ahead of the system PM) when go is
  available, since not all distros package `ov` in their base repos,
  and falls back to the system PM otherwise.

functions/_fish_deps_catalog.fish

@@ -9,6 +9,26 @@
 #   _fdc_pm, _fdc_special) describing every managed shell dependency.
 #   Must be called before accessing any _fdc_* array.
 #
+#   Tiers:
+#     req   Required            — the shell does not function without these.
+#     rec   Recommended          — meaningfully enhance the experience across
+#                                  multiple functions; the bulk of the
+#                                  catalog.
+#     opt   Optional             — minor, single-purpose wrapper
+#                                  conveniences (e.g. backs one wrapper
+#                                  function) that only matter if you already
+#                                  use that specific tool. Skipped by
+#                                  `fish-deps install`/`sync` unless
+#                                  `--optional` (or `--all`) is passed.
+#     term  Terminal Emulators   — GPU-accelerated terminal emulators
+#                                  (kitty, wezterm) that only matter if one
+#                                  of them is your actual terminal. Skipped
+#                                  by `fish-deps install`/`sync` unless
+#                                  `--terminals` (or `--all`) is passed.
+#     int   Integrations         — opt-in third-party services requiring
+#                                  their own account/setup (wakatime,
+#                                  tailscale).
+#
 # EXAMPLE
 #   _fish_deps_catalog
 #   echo $_fdc_bins
@@ -16,27 +36,27 @@ function _fish_deps_catalog
     set -g _fdc_bins \
         uv cargo fish starship fzf zoxide direnv paru yay \
         wakatime tailscale \
-        eza lsd bat btop dust duf prettyping ov rg lazygit lazydocker trash kitty wezterm python3 yt-dlp screen
+        eza lsd bat btop dust duf prettyping go ov rg lazygit lazydocker docker trash kitty wezterm python3 yt-dlp screen
 
     set -g _fdc_tiers \
         rec rec req rec req rec rec rec rec \
         int int \
-        rec rec rec rec rec rec rec rec rec rec rec rec rec rec rec rec rec
+        rec rec rec opt opt opt opt opt rec rec opt opt opt rec term term rec opt opt
 
     set -g _fdc_cargo \
         "" "" "" starship "" zoxide "" "" "" \
         "" "" \
-        eza lsd bat "" du-dust "" "" ov ripgrep "" "" trashy "" "" "" "" ""
+        eza lsd bat "" du-dust "" "" "" "" ripgrep "" "" "" trashy "" "" "" "" ""
 
     set -g _fdc_pm \
         uv cargo fish starship fzf zoxide direnv "" yay \
         wakatime tailscale \
-        eza lsd bat btop dust duf prettyping ov ripgrep lazygit lazydocker trash kitty wezterm python yt-dlp screen
+        eza lsd bat btop dust duf prettyping go ov ripgrep lazygit lazydocker docker trash kitty wezterm python yt-dlp screen
 
     set -g _fdc_special \
         curl-uv rustup-installer git-cargo-fish curl-installer fzf-update "" "" paru-build yay-build \
         wakatime-binary "" \
-        "" "" "" "" "" "" "" "" "" "" curl-lazydocker "" "" "" "" "" ""
+        "" "" "" "" "" "" "" "" go-ov "" "" curl-lazydocker "" "" "" "" "" "" ""
 end
 
 # SYNOPSIS