docs: prefix bare "Zeus" with "OpenHPSDR" across user-facing pages
Normalises user-facing prose to read "OpenHPSDR Zeus". Mobile.md was already
prefixed ("Openhpsdr-Zeus") and is now aligned with the rest of the wiki.
Code identifiers (Zeus.Server, Zeus.slnx, Zeus.Dsp, Zeus.Protocol1/2,
Zeus.Contracts), filesystem paths (~/.local/share/Zeus, Zeus.app), and
installer filenames (Zeus-X.Y.Z-...) are left as-is.
Major wiki overhaul: per-panel screenshots + code-verified facts
Section screenshots captured from a live HL2 RX session at 1920x1100 and
embedded on the corresponding pages:
Top-Bar-and-Status top-bar.png
Modes-and-Bands modes.png + band.png
Bandwidth-and-Filters bandwidth.png + filter.png + filter-panel.png
Front-End-and-Gain front-end.png + agc.png + zoom-drive-mic.png
Frequency-and-VFO frequency-vfo.png
Panadapter-and-Waterfall already had two; now also references zeus-filter-panel-open.png
Meters s-meter.png + tx-stage-meters.png
DSP dsp.png
TX-Controls transport-bar.png
CW-Keyer cw-keyer.png
QRZ-and-World-Map qrz-lookup.png + great-circle-map.png
Logbook logbook.png
Home hero shot zeus-connected-panadapter.png
Prose reconciled against the React frontend (zeus-web/src). Notable
factual fixes:
* Map modifier is Alt, not M. The 'hold M' instruction in Shortcuts
and Panadapter and QRZ-and-World-Map was wrong — there is no
M-binding in use-keyboard-shortcuts.ts. Replaced with Alt-hold,
Alt-drag, Alt-wheel.
* ZOOM range is 1x..8x integer steps (was documented as 1x..10x).
* Bandwidth presets are mode-dependent: SSB Narrow/Wide+3k/4k/6k,
AM AM 6.6k/Wide 8.0k+3k/4k/6k, CW only CW 250/CW 500.
* Filter bank has 10 fixed F-slots + VAR1/VAR2 user slots; the '=='
hamburger opens an Advanced Filter Ribbon with a graphical passband
editor and 6 mode-dependent preset bandwidths.
* AGC: single AGC-T slider, 0-120 dB step 1, default 80; no mode
buttons.
* AF: -50 dB to +20 dB.
* DSP: NB cycles Off/NB1/NB2 with threshold 0-100 default 20; NR
cycles Off/NR(ANR)/NR2(EMNR); ANF time-domain, NBP RXA frequency-
domain, SNB spectral; Leveler Max Gain 0-15 dB step 0.5 default 5.
* VFO type-input accepts kHz (not MHz), comma decimal accepted,
range 0-60 MHz.
* S-Meter scale is -127 dBm (S0) to -13 dBm (S9+60), 1500 ms peak
decay, post-AGC.
* TX Stage Meters: nine taps (ALC pair, MIC, EQ, LVLR, CFC pair,
COMP, ALC, ALC GR, OUT) with -30..+12 dBFS / 0..25 dB GR scales,
and a -400 dBFS bypass sentinel.
* CW Keyer macro send is wired to a callback but does not yet key
the radio; the Morse strip is decorative; iambic toggle not yet
in UI.
* SPLIT / RIT / SAVE MEM buttons render but are placeholders.
* Map tiles are Esri World Imagery; the horizontal sweep lines are
decorative, not a real day/night terminator.
Sidebar already had Installation; Home now lists it under Getting
around. README in the main repo still hands off to this wiki for the
full user guide.
docs: add initial user guide covering every UI control