feat: menubar + icon rail, minimap, Blender-style navigation
A pass over the whole interface, driven by using it on a 5.7-hour capture. **Layout.** The 320px sidebar of labelled widgets is now a 46px icon rail — one column of square buttons, sized so it costs the spectrogram as little width as possible — plus a menubar for one-shot actions. Menu items are defined by naming a keymap entry, so an item reuses that binding's action, gate and shortcut label and the two can't drift; items grey out under exactly the conditions that make the shortcut a no-op. Settings that need more than an on/off (FFT size, colours/levels, annotation kinds) open as popouts beside the rail rather than widening it. Every toggle has exactly one home: nothing is reachable from both the rail and a menu. Icons are drawn from raylib primitives rather than an atlas or font glyphs — the bundled font has no symbol coverage, and vector shapes stay crisp at any UI scale with no assets to ship. **Navigation.** Left-drag now pans and Ctrl+drag box-selects, with Tab swapping which is bare (Ctrl always means "the other one", so either mode does both). Previously a bare left-drag did three different things depending on invisible state, with no cursor feedback; the cursor now reports the active gesture. Wheeling a scrollbar pans that axis, or zooms it with Shift. **Minimap.** Whole-file thumbnail in the top-right with the current view drawn on it; click or drag to scrub, corner handle switches between two sizes. Rendered once per size into a cached texture and rebuilt only when its content changes — panning and zooming just move the rectangle drawn on top. The reduction is strided (each thumbnail cell samples at most 8x8), because reducing every segment x bin meant ~1 G reads per rebuild and a visible hitch on every overlay toggle. **Fixes found along the way:** - The timeline lane mapped events across the whole file while the spectrogram above it showed a zoomed window, so the two only lined up at full zoom-out and an event's tick sat nowhere near its burst. It is also properly toggleable now: the old flag only grew an always-present lane. - Clicks preferred the spectrogram over the minimap. Input handling runs ~900 lines before the draw pass that computed the minimap's rect, so a press there started a pan AND a scrub — two handlers writing app.view in one frame. Geometry queries that input depends on now live outside the draw pass. - Repainting during the background fill re-ran the full synchrosqueeze every 0.5 s. Zoomed out that is ~0.5 G bin-visits with four trig calls each, twice a second, for minutes — while showing almost nothing new, since folded segments land in columns already drawn. The interval now scales with how much work a repaint actually costs. - IsUserInteracting() sweeps 512 key codes and was called three times a frame; memoized per frame. - Frequency labels were drawn at a fixed offset wider than their gutter and overflowed into the rail. They are measured and right-aligned now, with one format chosen per axis so the column doesn't mix "3k" with "2.3k". - The horizontal scrollbar is pinned to the window bottom; it used to sit mid-layout competing with the scope's divider, and the scope covered it outright at larger window sizes. - The scope starts hidden — the spectrogram is the primary view. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01V8ZWfr5XZyyDttvkhJUgHN
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