feat(herdr): add Noctalia theme template

[mdj2812]

Summary

• add a community template that maps Noctalia colors onto herdr's complete custom UI palette
• safely merge managed colors into [theme.custom] while preserving the user's remaining configuration
• reload a running herdr server after palette changes and document initial setup

Template

• App: herdr
• Template id (directory): herdr
• New template
• Update to an existing template

What it themes

Renders Noctalia's surface, text, accent, and terminal status colors to $XDG_CONFIG_HOME/herdr/noctalia-colors.toml. The hook merges those values into herdr's [theme.custom] table so panels, selections, labels, and agent states follow the active Noctalia palette.

Test plan

• App version tested: herdr 0.8.0
• Validated all 47 template manifests
• Tested configs with and without an existing [theme.custom] section
• Confirmed existing settings and unknown custom keys are preserved
• Confirmed repeated hook application is idempotent
• Confirmed malformed inline custom tables fail without modifying the config
• Applied locally as a Noctalia user template and confirmed herdr picked it up
• Applied both a dark and light theme and visually confirmed each

Screenshots

Hooks

• What the hook does: merges rendered colors into [theme.custom], preserves unrelated settings, and asks a running herdr server to reload its config.
• It is idempotent: running it twice does not duplicate lines or corrupt the config.
• It fails loudly (non-zero exit, message on stderr) when the app's config is missing.
• It downloads nothing and executes nothing it did not ship in this directory.
• It touches only this app's own config.

Checklist

• The directory name matches the [catalog.<id>] id in template.toml.
• category is an allowed category.
• Every input_path names a file that exists in this directory.
• No generated output or app-specific personal config is committed.

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