namir-ui: the notice list is unbounded and unscrolled, so a noisy scan squeezes out the main panel

[ErwanLegrand]

crates/namir-ui/src/notices.rs:26-39, rendered at src/app.rs:61

The notice list is drawn unbounded inside Panel::top, with no cap and no scroll area. AppHost fans out one notice per scan warning (namir-app/src/host.rs:232-241), and a scan over a directory of unreadable files produces arbitrarily many.

Dozens of notices grow the top panel until CentralPanel is squeezed to nothing -- FR-UI-070's "non-modal" becomes effectively modal, with the dismiss buttons pushed off-screen.

Fix: wrap the notice loop in ScrollArea::vertical().max_height(...), or show the first N with an "and M more" line.

[ErwanLegrand]

Fixed in #145 (66c876c). The notice list is bounded on both axes now: push_deduplicated already capped the list at MAX_NOTICES = 16 by dropping the oldest (crates/namir-ui/src/notices.rs:177), and render now draws the loop inside egui::ScrollArea::vertical() capped at MAX_NOTICE_AREA_FRACTION (1/3) of ui.ctx().content_rect().height() (notices.rs:97-100), shrinking to content while the list is short.

Tested at the plugin's real 960x640 geometry: notices.rs:319-341 asserts a full 16-notice list (~736 px of rows in a 640 px editor) occupies no more than the bound, and the neighbouring test asserts the dismiss buttons stay reachable rather than being pushed off-screen.

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