From 31671f5791403cad1e8224d6e50582a54b9a1507 Mon Sep 17 00:00:00 2001
From: Codex <codex@example.com>
Date: Sat, 7 Mar 2026 07:13:07 +0000
Subject: [PATCH] sidebar fixes

---
 calculators_list.md                           | 40 +++++++++----------
 hdyc-svelte/src/lib/components/Sidebar.svelte | 24 ++++++-----
 hdyc-svelte/src/lib/data/calculators.ts       | 20 ++++++++++
 3 files changed, 54 insertions(+), 30 deletions(-)

diff --git a/calculators_list.md b/calculators_list.md
index 5f37f03..7dcd9c5 100644
--- a/calculators_list.md
+++ b/calculators_list.md
@@ -584,27 +584,27 @@ Whenever a new calculator is published via the REST API, it must be appended her
 - [ ] Fahrenheit to Newton (temp scale)
 - [ ] Fahrenheit to Rankine
 - [ ] Farads to Microfarads
-- [ ] Fathoms to Feet
-- [ ] Fathoms to Meters
+- [x] Fathoms to Feet
+- [x] Fathoms to Meters
 - [ ] Feet of seawater to PSI
-- [ ] Feet of Water to Atmosphere
-- [ ] Feet of Water to PSI
-- [ ] Feet per second to Kilometers per hour
-- [ ] Feet per second to Miles per hour
-- [ ] Feet to Centimeters
-- [ ] Feet to Fathoms
-- [ ] Feet to Inches
-- [ ] Feet to Kilometers
-- [ ] Feet to Miles
-- [ ] Feet to Millimeters
-- [ ] Feet to Yards
-- [ ] Femtograms to Picograms
-- [ ] Fermi to Meters
-- [ ] Fluid Ounces to Cups
-- [ ] Fluid Ounces to Gallons
-- [ ] Fluid Ounces to Liters
-- [ ] Fluid Ounces to Tablespoons
-- [ ] Fluid Ounces to Teaspoons
+- [x] Feet of Water to Atmosphere
+- [x] Feet of Water to PSI
+- [x] Feet per second to Kilometers per hour
+- [x] Feet per second to Miles per hour
+- [x] Feet to Centimeters
+- [x] Feet to Fathoms
+- [x] Feet to Inches
+- [x] Feet to Kilometers
+- [x] Feet to Miles
+- [x] Feet to Millimeters
+- [x] Feet to Yards
+- [x] Femtograms to Picograms
+- [x] Fermi to Meters
+- [x] Fluid Ounces to Cups
+- [x] Fluid Ounces to Gallons
+- [x] Fluid Ounces to Liters
+- [x] Fluid Ounces to Tablespoons
+- [x] Fluid Ounces to Teaspoons
 - [ ] Focal length to Angle of view
 - [ ] Foot-candles to Lux
 - [ ] Foot-pounds (energy) to Joules
diff --git a/hdyc-svelte/src/lib/components/Sidebar.svelte b/hdyc-svelte/src/lib/components/Sidebar.svelte
index 1b7461a..2585401 100644
--- a/hdyc-svelte/src/lib/components/Sidebar.svelte
+++ b/hdyc-svelte/src/lib/components/Sidebar.svelte
@@ -17,20 +17,21 @@
     const calcs = getCalculatorsByCategory(key);
 
     calcs.forEach(calc => {
-      const unit = calc.labels.in1;
-      const existing = buckets.get(unit);
-      if (existing) {
-        existing.push(calc);
-      } else {
-        buckets.set(unit, [calc]);
-      }
+      [calc.labels.in1, calc.labels.in2].forEach(unit => {
+        const existing = buckets.get(unit);
+        if (existing) {
+          existing.push(calc);
+        } else {
+          buckets.set(unit, [calc]);
+        }
+      });
     });
 
     const units = [...buckets.entries()]
       .sort(([a], [b]) => a.localeCompare(b))
       .map(([label, conversions]) => ({
         label,
-        conversions: conversions.slice().sort((a, b) => a.labels.in2.localeCompare(b.labels.in2)),
+        conversions: conversions.slice().sort((a, b) => a.name.localeCompare(b.name)),
       }));
 
     return { key, meta, units };
@@ -116,13 +117,16 @@
 
 <style>
   .sidebar {
+    flex: 0 0 280px;
     width: 280px;
-    height: 100%;
+    min-width: 280px;
+    position: sticky;
+    top: var(--header-h);
+    height: calc(100vh - var(--header-h));
     overflow-y: auto;
     background: var(--sidebar-bg);
     border-right: 1px solid var(--border);
     padding: 0;
-    flex-shrink: 0;
   }
   .sidebar-header {
     display: flex;
diff --git a/hdyc-svelte/src/lib/data/calculators.ts b/hdyc-svelte/src/lib/data/calculators.ts
index 7c71759..0502520 100644
--- a/hdyc-svelte/src/lib/data/calculators.ts
+++ b/hdyc-svelte/src/lib/data/calculators.ts
@@ -209,6 +209,26 @@ export const calculators: CalculatorDef[] = [
   {...{"slug": "dynes-to-newtons", "name": "Dynes to Newtons", "category": "weight", "type": "standard", "labels": {"in1": "Dynes", "in2": "Newtons"}, "factor": 1e-05, "hidden": true}, descriptionHTML: `<p>Mass measurement is a fundamental requirement in chemistry, logistics, and medical science. Dynes and Newtons are metrics used to quantify the amount of matter within an object, independent of its environment. The development of these units follows the history of global trade, from ancient balanced scales to modern electronic sensors.</p><p>The relationship between Dynes and Newtons is governed by precise ratios that allow for the scaling of mass across different technical contexts. In pharmaceutical manufacturing and chemical research, even a slight variance in this translation can impact the safety and efficacy of a product. High-fidelity conversion factors are therefore essential for professional accuracy.</p><p>Quantifying physical substance accurately is necessary for everything from laboratory experimentation to the heavy loads handled by shipping vessels. These standardized scales provide a common language for trade and exploration. Adhering to strict ratios ensures that logistical errors are minimized in global distribution networks.</p>`},
   {...{"slug": "ergs-to-joules", "name": "Ergs to Joules", "category": "energy", "type": "standard", "labels": {"in1": "Ergs", "in2": "Joules"}, "factor": 1e-07, "hidden": true}, descriptionHTML: `<p>Energy is the capacity to perform work, measured across various physical domains including thermodynamics, electromagnetism, and atomic physics. Ergs and Joules are standardized units that allow for the quantification of heat, mechanical energy, and electrical power. These metrics are the foundation for assessing efficiency and environmental impact.</p><p>The translation of Ergs into Joules is guided by the laws of thermodynamics, ensuring that the total energy value remains consistent across different measurement systems. In scientific research and utility management, precise conversion is required to track consumption and manage resources in complex power grids.</p><p>The comparative analysis of power generation technologies depends on accurate energy data and the clear transition between different units. This supports international collaboration in climate science. Global efforts toward industrial optimization are built on these standardized thermal and mechanical metrics.</p>`},
   {...{"slug": "feet-to-meters", "name": "Feet to Meters", "category": "length", "type": "standard", "labels": {"in1": "Feet", "in2": "Meters"}, "factor": 0.3048, "hidden": true}, descriptionHTML: `<p>The concept of linear dimension is central to spatial awareness and structural design. Feet and Meters represent different scales within this dimension, serving as building blocks for everything from architectural blueprints to astronomical mappings. Historically, these units emerged from various cultural needs for precision in trade and navigation.</p><p>Establishing a mathematical bridge between Feet and Meters requires adherence to standardized conversion factors. These constants ensure that measurements taken in one system maintain their physical integrity when translated into another. This interoperability is a requirement for global engineering projects and scientific collaboration.</p><p>Linear scales are the foundation of modern infrastructure. Whether used in high-precision manufacturing or large-scale civil engineering, maintaining accurate documentation of distance is essential for structural integrity. These metrics support the coordination of international supply chains and ensure that components manufactured in different regions interface correctly.</p>`},
+  {...{"slug": "fathoms-to-feet", "name": "Fathoms to Feet", "category": "length", "type": "standard", "labels": {"in1": "Fathoms", "in2": "Feet"}, "factor": 6.0}, descriptionHTML: `<p>Fathoms and Feet define vertical distance measurements used in nautical navigation and seafloor mapping.</p><p>One Fathom equals 6 Feet, so depth readings stay consistent across charts.</p><p>Marine survey teams rely on that ratio when reconciling historical logs with modern instrumentation.</p>`},
+  {...{"slug": "fathoms-to-meters", "name": "Fathoms to Meters", "category": "length", "type": "standard", "labels": {"in1": "Fathoms", "in2": "Meters"}, "factor": 1.8288}, descriptionHTML: `<p>Fathoms and Meters provide vertical scales for maritime and underwater operations.</p><p>One Fathom equals 1.8288 Meters, so depth recordings keep provenance across metric and imperial sources.</p><p>Oceanographers reference that ratio while aligning sonar data and dive planning.</p>`},
+  {...{"slug": "feet-of-water-to-atmosphere", "name": "Feet of Water to Atmosphere", "category": "pressure", "type": "standard", "labels": {"in1": "Feet of Water", "in2": "Atmosphere"}, "factor": 0.029495}, descriptionHTML: `<p>Feet of Water and Atmosphere describe hydrostatic pressure, keeping fluid columns and meteorological data consistent.</p><p>One Foot of Water equals 0.029495 Atmospheres, so head pressure values remain proportional during calculations.</p><p>Hydraulic engineers cite that conversion when verifying pressure vessels and pipeline simulations.</p>`},
+  {...{"slug": "feet-of-water-to-psi", "name": "Feet of Water to PSI", "category": "pressure", "type": "standard", "labels": {"in1": "Feet of Water", "in2": "PSI"}, "factor": 0.433474}, descriptionHTML: `<p>Feet of Water and PSI describe hydrostatic force per area, supporting pump calibration and divers' safety.</p><p>One Foot of Water equals 0.433474 PSI, keeping the relationship between depth and mechanical stress explicit.</p><p>Field technicians rely on that ratio when correlating flow meters with pressure feedback.</p>`},
+  {...{"slug": "feet-per-second-to-kilometers-per-hour", "name": "Feet per second to Kilometers per hour", "category": "speed", "type": "standard", "labels": {"in1": "Feet per second", "in2": "Kilometers per hour"}, "factor": 1.09728}, descriptionHTML: `<p>Feet per second and Kilometers per hour quantify speed for landing gears and pedestrian modeling.</p><p>One Foot per second equals 1.09728 Kilometers per hour, preserving traceability between imperial and metric rates.</p><p>Transit modelers use that factor when comparing traffic counts across regions.</p>`},
+  {...{"slug": "feet-per-second-to-miles-per-hour", "name": "Feet per second to Miles per hour", "category": "speed", "type": "standard", "labels": {"in1": "Feet per second", "in2": "Miles per hour"}, "factor": 0.681818}, descriptionHTML: `<p>Feet per second and Miles per hour measure velocity for runway thresholds and racetracks.</p><p>One Foot per second equals 0.681818 Miles per hour, so any motion data translates neatly between systems.</p><p>Aviation planners and automotive engineers rely on that figure during simulation runs.</p>`},
+  {...{"slug": "feet-to-centimeters", "name": "Feet to Centimeters", "category": "length", "type": "standard", "labels": {"in1": "Feet", "in2": "Centimeters"}, "factor": 30.48}, descriptionHTML: `<p>Feet and Centimeters describe linear distances used from carpentry to lab microscopy.</p><p>One Foot equals 30.48 Centimeters, keeping the same length data intact across documents.</p><p>Construction surveyors depend on that ratio to merge imperial blueprints with metric checklists.</p>`},
+  {...{"slug": "feet-to-fathoms", "name": "Feet to Fathoms", "category": "length", "type": "standard", "labels": {"in1": "Feet", "in2": "Fathoms"}, "factor": 0.1666666667}, descriptionHTML: `<p>Feet and Fathoms provide complementary scales for measuring depth and nautical clearance.</p><p>One Foot equals 0.1666666667 Fathoms, so conversions preserve the same physical height.</p><p>Marine pilots rely on this scaling when bridging shipboard logs with charted limits.</p>`},
+  {...{"slug": "feet-to-inches", "name": "Feet to Inches", "category": "length", "type": "standard", "labels": {"in1": "Feet", "in2": "Inches"}, "factor": 12.0}, descriptionHTML: `<p>Feet and Inches are foundational linear scales, spanning structural engineering and behavioral design.</p><p>One Foot equals 12 Inches, a ratio central to traditional drafting.</p><p>Carpenters and furniture makers enforce that standard across production details.</p>`},
+  {...{"slug": "feet-to-kilometers", "name": "Feet to Kilometers", "category": "length", "type": "standard", "labels": {"in1": "Feet", "in2": "Kilometers"}, "factor": 0.0003048}, descriptionHTML: `<p>Feet and Kilometers connect local measurements with regional mapping.</p><p>One Foot equals 0.0003048 Kilometers, so large canvases retain accuracy when shifting units.</p><p>Geospatial analysts trust that number when fusing survey grids with satellite data.</p>`},
+  {...{"slug": "feet-to-miles", "name": "Feet to Miles", "category": "length", "type": "standard", "labels": {"in1": "Feet", "in2": "Miles"}, "factor": 0.000189393939}, descriptionHTML: `<p>Feet and Miles describe ground distance over small and long scales.</p><p>One Foot equals 0.000189393939 Miles, keeping roadway data consistent.</p><p>Transportation engineers reference that conversion when planning intercity corridors.</p>`},
+  {...{"slug": "feet-to-millimeters", "name": "Feet to Millimeters", "category": "length", "type": "standard", "labels": {"in1": "Feet", "in2": "Millimeters"}, "factor": 304.8}, descriptionHTML: `<p>Feet and Millimeters cover impression ranges from buildings to precision parts.</p><p>One Foot equals 304.8 Millimeters, ensuring compatibility between field reports and design files.</p><p>Mechanical engineers use that ratio while verifying tolerance stacks.</p>`},
+  {...{"slug": "feet-to-yards", "name": "Feet to Yards", "category": "length", "type": "standard", "labels": {"in1": "Feet", "in2": "Yards"}, "factor": 0.3333333333}, descriptionHTML: `<p>Feet and Yards feature in land surveying and athletics track layouts.</p><p>One Foot equals 0.3333333333 Yards, so the small increments translate up to larger spans.</p><p>Survey crews rely on that factor when reconciling property lines with event planning.</p>`},
+  {...{"slug": "femtograms-to-picograms", "name": "Femtograms to Picograms", "category": "weight", "type": "standard", "labels": {"in1": "Femtograms", "in2": "Picograms"}, "factor": 0.001}, descriptionHTML: `<p>Femtograms and Picograms are mass units for micro to nanoscale samples.</p><p>One Femtogram equals 0.001 Picograms, so ultra-trace chemistry data stays proportional.</p><p>Analytical labs cite that ratio when comparing mass counts across differently scaled balances.</p>`},
+  {...{"slug": "fermi-to-meters", "name": "Fermi to Meters", "category": "length", "type": "standard", "labels": {"in1": "Fermi", "in2": "Meters"}, "factor": 1e-15}, descriptionHTML: `<p>Fermi and Meters measure nanoscale and atomic distances.</p><p>One Fermi equals 1e-15 Meters, keeping subatomic intervals in a measurable framework.</p><p>Particle physicists rely on that conversion when translating collision profiles into SI reports.</p>`},
+  {...{"slug": "fluid-ounces-to-cups", "name": "Fluid Ounces to Cups", "category": "volume", "type": "standard", "labels": {"in1": "Fluid Ounces", "in2": "Cups"}, "factor": 0.125}, descriptionHTML: `<p>Fluid Ounces and Cups describe convenient volume quantities for culinary and laboratory recipes.</p><p>One Fluid Ounce equals 0.125 Cups, keeping beverage and reagent lists coherent.</p><p>Brewmasters and lab technicians rely on that proportion for ingredient scaling.</p>`},
+  {...{"slug": "fluid-ounces-to-gallons", "name": "Fluid Ounces to Gallons", "category": "volume", "type": "standard", "labels": {"in1": "Fluid Ounces", "in2": "Gallons"}, "factor": 0.0078125}, descriptionHTML: `<p>Fluid Ounces and Gallons express larger fluid volumes for storage and logistics.</p><p>One Fluid Ounce equals 0.0078125 Gallons, keeping tank charts consistent.</p><p>Fuel attendants and marine planners rely on that ratio for inventory reconciliation.</p>`},
+  {...{"slug": "fluid-ounces-to-liters", "name": "Fluid Ounces to Liters", "category": "volume", "type": "standard", "labels": {"in1": "Fluid Ounces", "in2": "Liters"}, "factor": 0.0295735295625}, descriptionHTML: `<p>Fluid Ounces and Liters bridge domestic recipes with metric lab protocols.</p><p>One Fluid Ounce equals 0.0295735295625 Liters, so measurements remain consistent across mixing tables.</p><p>Catering teams and chemical analysts cite that conversion for batch preparation.</p>`},
+  {...{"slug": "fluid-ounces-to-tablespoons", "name": "Fluid Ounces to Tablespoons", "category": "volume", "type": "standard", "labels": {"in1": "Fluid Ounces", "in2": "Tablespoons"}, "factor": 2.0}, descriptionHTML: `<p>Fluid Ounces and Tablespoons describe dispense volumes for kitchens and compounding.</p><p>One Fluid Ounce equals 2 Tablespoons, retaining the same volumetric narrative.</p><p>Culinary stylists and pharmacy techs rely on that ratio when scaling mixtures.</p>`},
+  {...{"slug": "fluid-ounces-to-teaspoons", "name": "Fluid Ounces to Teaspoons", "category": "volume", "type": "standard", "labels": {"in1": "Fluid Ounces", "in2": "Teaspoons"}, "factor": 6.0}, descriptionHTML: `<p>Fluid Ounces and Teaspoons measure small volumetric increments in cooking and dosing.</p><p>One Fluid Ounce equals 6 Teaspoons, ensuring proportional scaling when quantities shrink.</p><p>Dietitians and med techs depend on that conversion when translating recipes and prescriptions.</p>`},
   {...{"slug": "foot-pounds-to-newton-meters", "name": "Foot-Pounds to Newton-Meters", "category": "length", "type": "standard", "labels": {"in1": "Foot-Pounds", "in2": "Newton-Meters"}, "factor": 1.35581795}, descriptionHTML: `<p>The concept of linear dimension is central to spatial awareness and structural design. Foot-Pounds and Newton-Meters represent different scales within this dimension, serving as building blocks for everything from architectural blueprints to astronomical mappings. Historically, these units emerged from various cultural needs for precision in trade and navigation.</p><p>Establishing a mathematical bridge between Foot-Pounds and Newton-Meters requires adherence to standardized conversion factors. These constants ensure that measurements taken in one system maintain their physical integrity when translated into another. This interoperability is a requirement for global engineering projects and scientific collaboration.</p><p>Linear scales are the foundation of modern infrastructure. Whether used in high-precision manufacturing or large-scale civil engineering, maintaining accurate documentation of distance is essential for structural integrity. These metrics support the coordination of international supply chains and ensure that components manufactured in different regions interface correctly.</p>`},
   {...{"slug": "gallons-to-liters", "name": "Gallons to Liters", "category": "volume", "type": "standard", "labels": {"in1": "Gallons", "in2": "Liters"}, "factor": 3.78541178}, descriptionHTML: `<p>Volume measurements define the three-dimensional space occupied by fluids, gases, and solids. Gallons and Liters are standard units that allow for the calculation of capacity in everything from household containers to industrial storage vats. The history of volume measurement is closely tied to the needs of agriculture and maritime commerce.</p><p>Converting volume from Gallons to Liters requires a systematic approach to account for the cubic relationships in spatial measurement. Accuracy in these calculations is vital for chemical solutions, fuel management, and large-scale manufacturing where volume-to-weight ratios must be strictly monitored to maintain safety and consistency.</p><p>Three-dimensional capacity is a critical metric in fluid logistics and volumetric shipping. Clear translation of data between units is a fundamental requirement for designing infrastructure capable of accommodating specific volumes. This standardization facilitates fair and transparent trade across different regional measurement systems.</p>`},
   {...{"slug": "gigabytes-to-megabytes", "name": "Gigabytes to Megabytes", "category": "data", "type": "standard", "labels": {"in1": "Gigabytes", "in2": "Megabytes"}, "factor": 1000.0}, descriptionHTML: `<p>Digital information is quantified through bit-based scales that define storage capacity and transmission bandwidth. Gigabytes and Megabytes are units used to measure the volume of digital data in the context of modern computing. As technology advances, the scale of data handled by servers continues to increase, making these units central to infrastructure management.</p><p>Technological standards for data often vary between decimal and binary definitions, making the conversion of Gigabytes to Megabytes a critical task for systems architecture. Accuracy in these calculations ensures that hardware procurement and cloud resource allocation are performed efficiently, preventing unexpected storage shortages or cost overruns.</p><p>Measuring digital metrics is essential for assessing system performance in both consumer electronics and hyperscale data centers. Clear communication of file sizes and network throughput supports effective software development. These scales help in managing digital footprints in an increasingly data-driven world.</p>`},