fix: omp.json -- port leading/trailing rounded caps + final_space=false to the source theme (was only in Get-MiOS.ps1's embedded copy, but install uses the source)

Operator: "powerline doesn't reach the right side on spawn".

Earlier fixes (53c036a, eab2e5b) added a leading_diamond U+E0B6 cap on
the shell segment (line 1) + status segment (line 2), and a trailing_
diamond U+E0B4 on the time segment + final_space=false -- but those
edits landed in $Script:MiosOmpJson INSIDE Get-MiOS.ps1 (a stage-time
fallback) NOT in the source theme at usr/share/mios/oh-my-posh/mios.omp
.json which is what build-mios.ps1's Install-WindowsBranding actually
copies to M:\MiOS\themes\mios.omp.json.

So operators were getting the OLD un-capped theme on every install.
Ported the four diamond changes (line-1 leading + line-2 leading +
time trailing + status powerline-conversion) to the source theme. The
[theme.prompt] runtime substitution in build-mios.ps1 still patches
glyph values but doesn't add segments -- so the diamond placement had
to live in the source.

Author: Kabuki94

usr/share/mios/oh-my-posh/mios.omp.json

@@ -1,7 +1,8 @@
 {
   "$schema": "https://raw.githubusercontent.com/JanDeDobbeleer/oh-my-posh/main/themes/schema.json",
   "version": 4,
-  "final_space": true,
+  "//final_space": "false: don't reserve a trailing column after the prompt -- the right-aligned time segment uses trailing_diamond U+E0B4 to reach col 79 of the frameless 80-col terminal.",
+  "final_space": false,
   "//": [
     "MiOS Oh-My-Posh theme.",
     "All Nerd Font private-use-area glyphs are encoded as JSON \\uXXXX",
@@ -20,10 +21,14 @@
       "alignment": "left",
       "segments": [
         {
+          "//": "Leading rounded cap (U+E0B6) so the colored powerline starts at col 0 of the frameless MiOS terminal -- replaces the previous plain U+256D U+2500 text prefix that left cols 0-2 uncolored. Background shared with the next 'shell' segment so the cap merges visually.",
           "type": "text",
-          "style": "plain",
-          "foreground": "#B7C9D7",
-          "template": "\u256d\u2500"
+          "style": "diamond",
+          "leading_diamond": "\ue0b6",
+          "trailing_diamond": "",
+          "background": "#1A407F",
+          "foreground": "#E7DFD3",
+          "template": ""
         },
         {
           "type": "shell",
@@ -194,10 +199,11 @@
           "template": " {{ if not .Error }}{{ .Icon }}{{ .Percentage }}{{ end }}{{ .Error }} \uf295 "
         },
         {
+          "//": "Trailing rounded cap (U+E0B4) so the right-aligned powerline reaches the right edge of the frameless terminal. diamond style with leading_diamond=cap-merge + trailing_diamond=hard-cap fills the last cell with color instead of dropping back to terminal default.",
           "type": "time",
-          "style": "powerline",
-          "invert_powerline": true,
-          "powerline_symbol": "\ue0b6",
+          "style": "diamond",
+          "leading_diamond": "\ue0b6",
+          "trailing_diamond": "\ue0b4",
           "background": "#1A407F",
           "foreground": "#E7DFD3",
           "properties": {
@@ -213,18 +219,24 @@
       "newline": true,
       "segments": [
         {
+          "//": "Second-line leading rounded cap (U+E0B6) so the colored powerline reaches col 0. Status segment is now powerline-style sharing the cap's background.",
           "type": "text",
-          "style": "plain",
-          "foreground": "#B7C9D7",
-          "template": "\u2570\u2500"
+          "style": "diamond",
+          "leading_diamond": "",
+          "trailing_diamond": "",
+          "background": "#3E7765",
+          "foreground": "#E7DFD3",
+          "template": ""
         },
         {
           "type": "status",
-          "style": "plain",
-          "foreground": "#3E7765",
-          "foreground_templates": [
+          "style": "powerline",
+          "powerline_symbol": "",
+          "background": "#3E7765",
+          "background_templates": [
             "{{ if gt .Code 0 }}#DC271B{{ end }}"
           ],
+          "foreground": "#E7DFD3",
           "properties": {
             "always_enabled": true
           },