feat(client): Phase 0 — data-layer prerequisites

[Copilot]

Implements Phase 0 of the launcher UI polish plan: extends SavedServer with fields the redesign requires, adds a ServerStatus enum with heuristic derivation, and prepares TextRun/GlassQuad for non-breaking forward extensibility.

config/servers.rs

• ServerStatus enum (Online, Sleeping, Unreachable) with serde derives
• SavedServer::derived_status() — heuristic: None → Unreachable; age < 6h → Online; age < 7d → Sleeping; else Unreachable (temporary stand-in for runtime ping)
• New schema fields — all #[serde(default)] for backwards-compatible deserialization of existing servers.json:
  • os_label: Option<String>, tags: Vec<String>, wol_supported: bool, last_latency_ms: Option<u32>

ui/launcher/server_card.rs

• CardFilter::Tag(String) variant added; enum is now Clone-only (not Copy)
• label() signature changed from fn label(self, total_cards: usize) → fn label(&self) -> String
• matches_filter() now takes &CardFilter and handles the Tag branch via self.tags.contains(tag)
• ServerCard stores tags: Vec<String> populated from SavedServer

ui/widgets/mod.rs

• Rect::ZERO constant added
• TextRun gains bold: bool and icon: bool (both default false); manual Default impl sets font_size: 14.0 (not 0.0)
• GlassQuad gets a Default impl using Rect::ZERO and zeroed floats
• All TextRun { … } construction sites across the codebase migrated to ..Default::default() — ~50 call sites across overlays, launcher widgets, and card grid

// Before
ctx.push_text_run(TextRun {
    x: r.x + 18.0, y: r.y + 60.0,
    text: self.display_name.clone(),
    font_size: 16.0,
    color: theme::LT_TEXT_PRIMARY,
    monospace: false,
});

// After — forward-compatible with Phase 1 bold + Phase 5 icon fields
ctx.push_text_run(TextRun {
    x: r.x + 18.0, y: r.y + 60.0,
    text: self.display_name.clone(),
    font_size: 16.0,
    color: theme::LT_TEXT_PRIMARY,
    ..Default::default()
});

Plan progress tracker updated: Pass 0 and Phase 0 checked off.

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