Shrink a clip with the wave and drop it with a click beside (#357)

Zoomed out, the wave left room above and below it, but the bright file,
the picked clip and its handles still took the whole height. And a click
in the wave beside the picked clip kept it picked, so only the strip
could take it back to the sound.

- fileReach in waveView.ts is how far up and down the file reaches:
  full scale and its inset, never past the area. At level 1 it is the
  whole height, zoomed in too.
- The bright file, the shade outside the clip and the two handles are
  drawn within that reach.
- A click over the wave beside the picked clip picks the sound. Inside
  the clip or on a handle nothing changes, and a drag still spans the
  clip anew.

Tests:
- Unit wave-view: 11 green (1 new), a counter-check red
- e2e 34 (melektaus-atx): ALL PASSED, 91 checks (1 new)
- Gate (melektaus-atx): CHECK EXIT 0, 271 files, 4195 tests

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/editor/wave-view.test.ts

@@ -7,6 +7,7 @@ import {
   clampWave,
   draggedSpan,
   edgeAt,
+  fileReach,
   fitWave,
   levelMarks,
   MAX_LEVEL,
@@ -43,6 +44,13 @@ describe('the height of the wave (#357)', () => {
     expect(loud[0]).toBe(-24);
     expect(loud).not.toContain(0);
   });
+
+  it('lets the file and its clip reach as high as full scale zoomed out, never past the area', () => {
+    // Full scale 100 px from the middle at level 1, 6 px inset, 106 px of room.
+    expect(fileReach(1, 100, 6, 106)).toBe(106);
+    expect(fileReach(0.25, 100, 6, 106)).toBe(31);
+    expect(fileReach(4, 100, 6, 106)).toBe(106);
+  });
 });
 
 describe('the wave view', () => {