Redraw eleven category icons for legibility and correctness

[sdunster]

Legibility and correctness pass over the category icon set. Picked ten icons at random plus rcr, worked through what each one's defects actually were.

chain_saw, industrial_domestic_rescue, and attend_other were dropped from this PR after review.

Wrong metaphor

• attend_hq — a document with a flagpole beside it. Its categories are "Attend RHQ" and "Attend SHQ", so it is now a headquarters building flying a flag.
• attend_other_unit_not_ooaa / _ooaa — the "building" was a bare grid that read as a window or a spreadsheet, and the arrow overlapped its edge. Both are now a unit building with a door and windows, with the arrow clear of it. The pair keeps its existing left/right convention.
• field_core_skills — the same briefcase as job_ready with an orange square added, so the two were near indistinguishable. Now a hard hat.

Strokes colliding with the shape they sit on

• maintenance_building_land — the orange tool ran diagonally through the house wall and door. House and tool now sit side by side.
• earthquake — the orange zigzag crossed the house at mid-wall, so it read as hills behind a house. The house now stands on a ground line with the crack running down its wall.
• land_search — the orange terrain line overshot the lens rim. Now contained within the lens, and the meaningless dot at the centre is gone.

Weak or ambiguous

• flood_ops_non_rescue — the sandbags were plain capsules and read as a pile of pebbles. Now a stacked barrier of tied bags above the water.
• search — the orange dot at the lens centre carried no meaning. The lens now holds a figure, which is what the category searches for, and no longer competes with land_search and search_evidence.
• public_relations — a single generic bubble, close to the one in critical_incident_support. Now a pair of bubbles, for engagement rather than a lone message. Also drops a translate() offset in favour of real coordinates.
• rcr — the car sat in the lower-left with the top-right empty, the cabin outline crossed itself, the orange scribble inside the body read as noise, and the impact marks floated free of the vehicle. Now centred, with a clean side profile, a crumpled bonnet as the damage cue, and the orange impact rays anchored to the point of impact.

Conventions

Every icon keeps the house style: 48×48 viewBox, 2.4 navy stroke, icon-stroke / icon-accent-stroke classes intact so theme, hover and active colouring still work, orange on a single secondary detail, and the canvas filled the way the rest of the set fills it.

Only .svg files changed — no code and no icon names, so no call sites are affected.

Testing

• npm run test:unit — 21 files, 146 tests, all passing.
• Every icon rendered at 140px, 48px, 32px and 20px, before against after, and against its neighbours in the set to check legibility at button size and to catch metaphor collisions.

🤖 Generated with Claude Code

https://claude.ai/code/session_01JqpAgLZfQLCECpnkdi1wAc